Fix build status error check condition

[dobrac]

Fix build status error check condition

---

Note

Fixes not-found error detection in template build status handler, removes unused DB error types, and adds an integration test for 400 on invalid ids.

• API (template build status):
  • Use errors.As with templatecache.TemplateBuildInfoNotFoundError for not-found detection in packages/api/internal/handlers/template_build_status.go.
  • Import internal/cache/templates and drop reliance on shared/pkg/db for this check.
• DB Errors:
  • Remove unused SnapshotNotFoundError and BuildNotFoundError from packages/shared/pkg/db/errors.go.
• Tests:
  • Add integration test tests/integration/internal/tests/api/templates/status_build_test.go asserting 400 Bad Request for invalid template/build IDs.

^{Written by Cursor Bugbot for commit f8c0ef1. This will update automatically on new commits. Configure here.}

[djeebus]

Can we get a test for this?

[dobrac]

Actually, the issue is different 🤦

the initial was fix incorrect, should be fixed now