Draft: Fix dismiss pipeline editor popover

What does this MR do and why?

Describe in detail what your merge request does and why.

Addressing problem with popover on pipeline editor page #361403 (closed)

The problem is, clicking outside of the popover will only dismiss it temporarily. Selecting a new branch will refresh the page and bring back the popover. We must click on the Close button within the popover to dismiss it permanently.

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Related to #361403 (closed)