Resolve needless_continue clippy lint

Summary:
```lang=text
warning: this `continue` expression is redundant
  --> fbcode/buck2/app/buck2_client/src/commands/log/diff/action_divergence.rs:84:21
   |
84 |                     continue;
   |                     ^^^^^^^^
   |
   = help: consider dropping the `continue` expression
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
   = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
   --> fbcode/buck2/app/buck2_client_ctx/src/stdin.rs:129:21
    |
129 |                     continue;
    |                     ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
    = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
   --> fbcode/buck2/app/buck2_client_ctx/src/stdin.rs:137:17
    |
137 |                 continue;
    |                 ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue

warning: this `continue` expression is redundant
   --> fbcode/buck2/app/buck2_error/src/starlark_error.rs:106:17
    |
106 |                 continue;
    |                 ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
    = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
  --> fbcode/buck2/app/buck2_events/src/span.rs:53:25
   |
53 |                 None => continue,
   |                         ^^^^^^^^
   |
   = help: consider dropping the `continue` expression
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
   = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
   --> fbcode/buck2/app/buck2_interpreter_for_build/src/interpreter/module_internals.rs:209:25
    |
209 |                         continue;
    |                         ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
    = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
    --> fbcode/buck2/app/buck2_server/src/daemon/server.rs:1601:33
     |
1601 | ...                   continue;
     |                       ^^^^^^^^
     |
     = help: consider dropping the `continue` expression
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
     = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
    --> fbcode/buck2/app/buck2_server/src/daemon/server.rs:1609:25
     |
1609 |                         continue;
     |                         ^^^^^^^^
     |
     = help: consider dropping the `continue` expression
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue

warning: this `continue` expression is redundant
  --> fbcode/buck2/dice/dice/src/impls/task/state.rs:62:25
   |
62 |                         continue;
   |                         ^^^^^^^^
   |
   = help: consider dropping the `continue` expression
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
   = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
  --> fbcode/buck2/facebook/buck2tail/src/main.rs:70:17
   |
70 |                 continue;
   |                 ^^^^^^^^
   |
   = help: consider dropping the `continue` expression
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
   = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
  --> fbcode/buck2/facebook/buck2tail/src/main.rs:74:17
   |
74 |                 continue;
   |                 ^^^^^^^^
   |
   = help: consider dropping the `continue` expression
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue

warning: this `continue` expression is redundant
   --> fbcode/buck2/starlark-rust/starlark/src/debug/adapter/implementation.rs:159:47
    |
159 |                     Ok(Next::RemainPaused) => continue,
    |                                               ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
    = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
   --> fbcode/buck2/starlark-rust/starlark_bin/bin/bazel.rs:555:21
    |
555 |                     continue;
    |                     ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
    = note: requested on the command line with `-W clippy::needless-continue`

warning: this `continue` expression is redundant
   --> fbcode/buck2/superconsole/src/output.rs:242:13
    |
242 |             continue;
    |             ^^^^^^^^
    |
    = help: consider dropping the `continue` expression
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_continue
    = note: requested on the command line with `-W clippy::needless-continue`

errors: 0; warnings: 14
```

Reviewed By: diliop

Differential Revision: D72737414

fbshipit-source-id: 74fb89895a83bd306a81b28fa9e3499c416d180d

Author: David Tolnay

src/output.rs

@@ -239,7 +239,6 @@ mod tests {
         // We expect that should_render() will eventually return true.
         while !output.should_render() {
             std::thread::yield_now();
-            continue;
         }
 
         // Likewise, we expect that sending output and finalizing wold fail.