BUILD-8726 docs: Update cursor docs and prompt

[mikolaj-matuszny-ext-sonarsource]

Update rules and prompt

[sonarqubecloud]

🤖 Pull Request summary

Updates Cirrus CI to GitHub Actions migration documentation with enhanced guidance and validation.

Changes:
• Added critical warnings and mandatory reading section with exact action versions and configurations
• Moved pre-migration checklist to earlier position with expanded validation requirements
• Added comprehensive validation checklist with specific action version verification
• Included common mistakes section highlighting missing parameters and wrong runner selections
• Enhanced README with improved Cursor prompt example emphasizing strict documentation adherence
• Added support section encouraging clarification requests over assumptions

💬 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