[Enhancement]: CI Packaging should not be triggered for test-only changes

[willkill07]

Affected area

Build, packaging, or CI

Problem or opportunity

Today, NeMo Flow CI isn't granular enough for testing + packaging. Gate packaging on actual code changes.

Proposed enhancement

Gate packaging on core files for code rather than ubiquitously approve

Runtime contract and binding impact

N/A

Alternatives considered

None

Acceptance criteria

Test-only changes should not trigger packaging stages