Remove validate, update build workflows.

[Breanna-Stryker]

Description

The validate bicep action is replaced with a validate-build action to only fire on pull_requests to the main branch and not to other protected branches. The failure to commit/build correctly was based on a detached head issue. This has been fixed with some work arounds;. The status failure to push when there isn't a difference between the mlz.json file builds, has been covered with a git status check.

To Test: Branch from this branch 'breestryker/validateactionbuildrepair' make changes to the bicep files under src/bicep and create a mock PR to main. The workflow action should fire.

Issue reference

The issue this PR will close: #426

Checklist

Please make sure you've completed the relevant tasks for this PR out of the following list:

• All acceptance criteria in the backlog item are met
• The documentation is updated to cover any new or changed features
• Manual tests have passed
• Relevant issues are linked to this PR

[glennmusa]

Looks to do the trick. Mind giving a demo/walk-through after the next standup using breestryker/validateactionbuildrepair?