BUILD-7900 working with simple ci-common-scripts and complex Starlark pipelines

[julien-carsique-sonarsource]

BUILD-7900

Fix naming for Cirrus CI
Remove extra verbosity.
Remove unnecessary cache_save thanks to pr-cleanup.yml.
Fix conditions and parameters.
Instruct to update documentation (README).
Replace pr-cleanup.yml if already present.
Remove/update Cirrus CI badges, path references, specifics...
Remove migrated tasks and files.
Help with understanding complex Starlark pipelines.

[sonarqubecloud]

🤖 Pull Request summary

Updates migration documentation to improve consistency and add critical documentation requirements.

• Standardizes terminology: Changes "CirrusCI" to "Cirrus CI" throughout for consistency
• Simplifies workflow examples: Removes unnecessary name fields and parameters in common action blocks
• Adds critical documentation phase: New Phase 6 covering badge updates, path migrations, and workflow replacements
• Enhances PR cleanup guidance: Distinguishes between manual implementations to replace vs. official SonarSource actions
• Expands troubleshooting: Adds cirrus.generated.yml section for understanding cirrus-modules configurations

Key areas for review focus:

• The new Phase 6 documentation requirements are comprehensive but may need validation against actual migration scenarios
• PR cleanup detection logic assumes manual implementations are always 64+ lines - verify this heuristic
• The cirrus.generated.yml generation command sequence should be

💬 Please send your feedback

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud