Assert inner-build TFM is what we expect

[jviau]

Issue describing the changes in this PR

resolves #1995

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

Additional information

This PR introduces an explicit failure if the inner-build TFM is overridden. Suppressing global properties was already performed as part of #1946, but this is an extra mile to avoid any future vague issues.