Remove drivers builds from pipeline

[Stringy]

Description

This PR removes all drivers builds and workflows from the master GHA pipeline, including the construction of full images. Instead, the slim image is retagged. This will be undone later on when the notion of a full and slim image is completely deprecated from the product.

Checklist

• [ ] Investigated and inspected CI test results
• [ ] Updated documentation accordingly

Automated testing

• [ ] Added unit tests
• [ ] Added integration tests
• [ ] Added regression tests

If any of these don't apply, please comment below.

Testing Performed

TODO(replace-me) Use this space to explain how you tested your PR, or, if you didn't test it, why you did not do so. (Valid reasons include "CI is sufficient" or "No testable changes") In addition to reviewing your code, reviewers must also review your testing instructions, and make sure they are sufficient.

For more details, ref the Confluence page about this section.

[Stringy]

I have tested the manifest creation changes with run-multiarch-builds label added and removed, and in both scenarios the manifests are created correctly. I'll leave the multiarch builds on now.

[Stringy]

Closing now in favour of #1667