Adjust the callout and text to use the word alert instead of "banner"
What does this MR do and why?
This MR addresses the suggestions in https://gitlab.com/gitlab-org/gitlab/-/issues/415508
suggestion (non-blocking):
We are using a pajamas alert here. There is also a pajamas component of banner. We should be explicit in all places in the code about it being an alert and in the MR title/description. Otherwise it can lead to more confusion of understanding which one is used.
MR acceptance checklist
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