feat: Version 1.2 - comprehensive database migration guidelines using… (#10519)

* feat: Version 1.2 - comprehensive database migration guidelines using the Expand-Contract pattern

* Update src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD

Co-authored-by: Copilot <[email protected]>

* fix: Cleanup text and typos

* feat: Implement migration validation workflow and add migration validator scripts

* Update src/backend/base/langflow/alembic/migration_validator.py

Co-authored-by: Copilot <[email protected]>

* Update src/backend/base/langflow/alembic/migration_validator.py

Co-authored-by: Copilot <[email protected]>

* Update src/backend/base/langflow/alembic/migration_validator.py

Co-authored-by: Copilot <[email protected]>

* fix: moved the test_migrations directory to under tests

* feat: Added migration validator to pre-commit check.

* fix: improved test performance.

* fix: optimized attribute resolution in migration validator

* feat: add comprehensive tests for migration validator and guidelines

* fix: Lint is complaining about shebang declared but not being used.

* fix: Shebang reinstated.

* Update src/backend/base/langflow/alembic/DB-MIGRATION-GUIDE.MD

Co-authored-by: Copilot <[email protected]>

* Update .github/workflows/migration-validation.yml

Co-authored-by: Copilot <[email protected]>

* feat: color improvments

* Update .github/workflows/migration-validation.yml

Removed

Co-authored-by: Copilot <[email protected]>

* Update .github/workflows/migration-validation.yml

Co-authored-by: Copilot <[email protected]>

* ci: Created relative paths for CI

* [autofix.ci] apply automated fixes

* [autofix.ci] apply automated fixes (attempt 2/3)

* [autofix.ci] apply automated fixes (attempt 3/3)

* fix: Component index json.

* [autofix.ci] apply automated fixes

* [autofix.ci] apply automated fixes (attempt 2/3)

* [autofix.ci] apply automated fixes (attempt 3/3)

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>