test: add upgrade migration check to ci (#12061)

* Add upgrade migration check to ci

* [autofix.ci] apply automated fixes

* Add fetch step

* ruff

* Add merge migration

* Revert "Add merge migration"

This reverts commit fd32424739a758646e77c5967420198ff21b5970.

backups

* coderabbit suggestions

  1. Shell hardening in workflow - set -euo pipefail, full path grep, quoted variables
  2. _WORKSPACE_ROOT extracted as module constant (also addresses Cristhianzl's review comment about parents[5] duplication)
  3. git missing returns None instead of raising FileNotFoundError
  4. # noqa: S603 added to subprocess.run (fixes the Ruff CI failure)
  5. FK noise filtering now also compares target table/column, not just ondelete/onupdate
  6. Removed redundant git fetch origin main step (fetch-depth: 0 already fetches all branches)
  7. Deduplicated Alembic config creation in _get_main_branch_head (moved before the if branch)
  8. Simplified dict type hints (removed unnecessary dict[tuple, object])

* test: improve migration tests from PR review feedback

- Narrow broad except clause to only wrap subprocess.run call
- Add specific error messages for multi-head and unresolvable revisions
- Remove redundant hardcoded schema test (covered by compare_metadata)
- Fix SQLite FK noise filter to skip ondelete/onupdate comparison
- Add downgrade verification to test_upgrade_from_main_branch
- Add test file and workflow to CI trigger paths
- Add prompt for follow-up PostgreSQL migration test PR

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* add engine check on downgrade

* [autofix.ci] apply automated fixes

* fix: harden CI error handling and test robustness

- Set validationPassed=false when validator crashes so CI fails instead of passing silently
- Wrap GitHub API calls in try-catch so comment-posting failures don't mask validation results
- Preserve git stderr in warnings for better CI debugging
- Add defensive handling for unexpected FK constraint shapes in SQLite noise filter
- Clean up SQLite WAL/SHM/journal companion files in test teardown

* Add explicit fetch to main

* ruff

* [autofix.ci] apply automated fixes

* Add sqlite filter tests and remove redundant fetch

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>