fix(lock): Be moore direct in the error message (#16233)

### What does this PR try to resolve?

This puts the action that failed front and center, rather than burying
it burying it after some long, variable-length content.

### How to test and review this PR?

Author: weihanglo

src/cargo/ops/lockfile.rs

@@ -55,13 +55,13 @@ pub fn write_pkg_lockfile(ws: &Workspace<'_>, resolve: &mut Resolve) -> CargoRes
     if let Some(locked_flag) = ws.gctx().locked_flag() {
         let lockfile_path = lock_root.as_path_unlocked().join(LOCKFILE_NAME);
         let action = if lockfile_path.exists() {
-            "updated"
+            "update"
         } else {
-            "created"
+            "create"
         };
         let lockfile_path = lockfile_path.display();
         anyhow::bail!(
-            "the lock file {lockfile_path} needs to be {action} but {locked_flag} was passed to prevent this\n\
+            "cannot {action} the lock file {lockfile_path} because {locked_flag} was passed to prevent this\n\
              help: to generate the lock file without accessing the network, \
              remove the {locked_flag} flag and use --offline instead."
         );

tests/testsuite/lockfile_compat.rs

@@ -517,7 +517,7 @@ fn locked_correct_error() {
         .with_status(101)
         .with_stderr_data(str![[r#"
 [UPDATING] `dummy-registry` index
-[ERROR] the lock file [ROOT]/foo/Cargo.lock needs to be created but --locked was passed to prevent this
+[ERROR] cannot create the lock file [ROOT]/foo/Cargo.lock because --locked was passed to prevent this
 [HELP] to generate the lock file without accessing the network, remove the --locked flag and use --offline instead.
 
 "#]])

tests/testsuite/offline.rs

@@ -767,7 +767,7 @@ fn offline_and_frozen_and_no_lock() {
     p.cargo("check --frozen --offline")
         .with_status(101)
         .with_stderr_data(str![[r#"
-[ERROR] the lock file [ROOT]/foo/Cargo.lock needs to be created but --frozen was passed to prevent this
+[ERROR] cannot create the lock file [ROOT]/foo/Cargo.lock because --frozen was passed to prevent this
 [HELP] to generate the lock file without accessing the network, remove the --frozen flag and use --offline instead.
 
 "#]])
@@ -780,7 +780,7 @@ fn offline_and_locked_and_no_frozen() {
     p.cargo("check --locked --offline")
         .with_status(101)
         .with_stderr_data(str![[r#"
-[ERROR] the lock file [ROOT]/foo/Cargo.lock needs to be created but --locked was passed to prevent this
+[ERROR] cannot create the lock file [ROOT]/foo/Cargo.lock because --locked was passed to prevent this
 [HELP] to generate the lock file without accessing the network, remove the --locked flag and use --offline instead.
 
 "#]])