docs(code-review): update GitLab usage

[bambam955]

Summary

Updated the documentation for using the code review bot in GitLab to reflect current best practices:

• Allow the job to fail to avoid failing entire pipelines
• Run before longer jobs, like unit tests and deployments, to reduce feedback loop

[github-actions]

Code Review

PR Title ✓

The title docs(code-review): update GitLab usage follows conventional commit format correctly.

CHANGELOG.md

The diff does not include CHANGELOG.md. Since this PR only updates documentation (not user-facing code), a changelog entry may not be necessary. However, if you'd like to be consistent with the requirement, consider adding a brief note.

Changes

The documentation updates are helpful:

• Adding allow_failure: true is a good practice to prevent the bot from blocking pipelines
• The stage ordering guidance is valuable for teams integrating the bot

One minor suggestion: The NOTE about stage ordering could be formatted as a blockquote (>) for better visual distinction in markdown.

Overall, this PR improves the documentation for GitLab users. Ship it!

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