fix: ci trigger bool inputs for bicep

[jaredfholgate]

Overview/Summary

null inputs are no longer translated to false in GitHub Actions, so need to explictly convert and supply defaults again.

This PR fixes/adds/changes/removes

N/A

Breaking Changes

None

Testing Evidence

Please provide any testing evidence to show that your Pull Request works/fixes as described and planned (include screenshots, if appropriate).

As part of this Pull Request I have

• Checked for duplicate Pull Requests
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• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
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