Standardize tables in CI API docs (part 1)

What does this MR do?

This cleans up the tables for about half the CI/CD-related API docs. I've had several feature MRs recently, including some from public contributors, where they added API docs but the tables were not ideal. I did not suggest many fixes to the contributions, because they matches the other tables already in the docs.

This updates the tables so that future MRs will have better tables to copy off of.

It also removes references to unsupported versions.

Related issues

• Related to Standardize tables in CI API docs (part 2) (!124563 - merged)

Author's checklist

• Optional. Consider taking the GitLab Technical Writing Fundamentals course.
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  • Style Guide.
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• ~"frontend"
• ~"backend"
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Reviewer's checklist

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• If the content requires it, ensure the information is reviewed by a subject matter expert.
• Technical writer review items:
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