[rust] Log a sanitized identifier only when it differs from the cased original

[HardMax71]

Fixes #25014.

sanitizeIdentifier now warns only when the final name differs from the cased original name, so a hyphenated or dotted name that only changes case no longer logs "PetRecord cannot be used as a model name. Renamed to PetRecord". Real renames still log, e.g. reserved words, leading digits and special characters (ApplicationJson ... Renamed to ApplicationSlashJson). The nameWasModified flag went away because the comparison replaces it.

On GitHub's REST description (github/rest-api-description@3cef12e8) the rust generator goes from 4 min 39 s and a 1.0 GB log (6,961,556 warnings) to 5.0 s and 2 MB (3,259 warnings), with identical generated files. The new testSanitizeIdentifierWarnsOnlyOnRename fails on master.

PR checklist

• Read the contribution guidelines.
• Ran ./mvnw clean package and ./bin/generate-samples.sh ./bin/configs/rust-*.yaml; this only changes logging, so no samples change.
• cc the Rust technical committee: @frol @farcaller @richardwhiuk @paladinzh @jacob-pro @dsteeley

---

Summary by cubic

Fixes #25014 by logging a sanitization warning only when the final name differs from the cased original. Case-only changes (e.g. pet-name → PetName) no longer log a false rename, while real renames like reserved words or special characters still do. On GitHub's REST description this cuts the Rust generator from 4m39s and a 1.0GB log to 5s and 2MB, with identical output. The new testSanitizeIdentifierWarnsOnlyOnRename fails on master and filters out log events from tests running in parallel.

^{Written for commit f759ab0. Summary will update on new commits.}

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[cubic-dev-ai]

All reported issues were addressed across 2 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[wing328]

Thanks for the contribution to improve the Rust generators