[Modules] [BPR alignment] Rename deploy.bicep to main.bicep and deploy.test.bicep to main.test.bicep

[eriqua]

Description

Closes #3133
Changes implemented to one module only to visualize/estimate work effort.

• Pipeline utilities: Limited updates (more needed to script synopsis than to actual code)
• Tests: Update needed for referenced modules
• Bicep templates: Updates needed for referenced children
• Workflows: No update needed (only to reusable workflow/template for publishing job)
• Docs: Massive updates needed in docs

Update: extending to all modules and docs

Pipeline references

For module/pipeline changes, please create and attach the status badge of your successful run.

Pipeline

Type of Change

Please delete options that are not relevant.

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Update to documentation

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code

[AlexanderSehr]

Note the depency on #2976