Clarify details about merge only if pipeline succeeds feature

What does this MR do?

This makes it a little more clear that enabling/disabling GitLab CI/CD pipelines will not disable the Only allow merge requests to be merged if the pipeline succeeds feature, which is correct behavior. The feature remains enabled to allow pipelines from other integrations (Jenkins) to prevent merges when they fail. See issue linked below for more details.

Also updates the linked screenshot to show the current UI, and cleans up the surrounding text.

Related issues

Closes #28886 (closed)

Author's checklist

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1. Primary Reviewer

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2. Technical Writer

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  1. Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review.
  2. Ensure a release milestone is set and that you merge the equivalent EE MR before the CE MR if both exist.
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