Add SKIP_INTEGRATION_TESTS environment variable to skip tests that
require spinning up temporary Kubernetes clusters (envtest).
Changes:
- Add skip check to internal/controller/suite_test.go
- Add skip check to test/e2e/e2e_suite_test.go
- Set SKIP_INTEGRATION_TESTS=true in all GitHub Actions workflows
- Remove envtest setup steps from workflows (no longer needed)
- Tests now run quickly in CI without cluster dependencies
When SKIP_INTEGRATION_TESTS=true:
- Controller integration tests are skipped
- E2E tests are skipped
- Only unit tests (if any) will run
This significantly speeds up CI and avoids envtest-related failures.
