Update logic to set shouldAddSBOM

[Francisco-Gamino]

Issue describing the changes in this PR

This PR fixes the logic to set $shouldAddSBOM. In my previous PR #919, I updated the logic to set this variable, but failed to consider when $IsReleaseBuild is $null as this assignment [bool]"$(IsReleaseBuild)" will throw in PowerShell. Additionally, I've added some extra logging to see how $shouldAddSBOM is set.

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

Additional PR information