[move-compiler] Print request for linter feedback if linter warnings present (#13795)

## Description 

We would like to present to the developer a place where they could
provide feedback on the available linters, with the information about
how to report feedback being immediately available whenever the linter
warnings are generated

## Test Plan 

All existing tests must pass plus manually tested that the message gets
printed.

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] protocol change
- [x] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

When linter warnings get generated, information about a place where the
feedback on linters can be provided will be printed alongside the
warning messages.

Author: awelc

move-compiler/src/diagnostics/mod.rs

@@ -288,6 +288,12 @@ impl Diagnostics {
         }
         v
     }
+
+    pub fn any_with_prefix(&self, prefix: &str) -> bool {
+        self.diagnostics
+            .iter()
+            .any(|d| d.info.external_prefix() == Some(prefix))
+    }
 }
 
 impl Diagnostic {