Make dismiss action on Banner changeable

[HDinger]

What are you trying to accomplish?

The Alpha::Banner component has the option to dismiss the banner via a button showing an "x". This button has an aria-label attribute with the hard coded text "Dismiss". This text is not changable. This PR aims to make the dismiss action customizable, e.g to open it for translations or different texts if the context requires it.

List the issues that this change affects.

Closes #2453

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

[changeset-bot]

🦋 Changeset detected

Latest commit: cb6fc94

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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[HDinger]

Hi @keithamus do you have any hint for me what I can do about the failing CI steps? It seems like they are unrelated or checking the branch from the wrong origin but maybe I am missing something here?

[camertron]

Hey @HDinger, thanks for this!

1. The system test failure is a known flake. I re-ran it, hopefully it'll pass this time. I'm planning to look into it this week.
2. I think the Triage / semver label check is failing because you don't have the right permissions. Don't worry about this one.
3. The Triage / Check for changeset check is failing because this PR doesn't have a changeset. Please run npx changeset in the repo root, follow the prompts, and commit and push the result.

[HDinger]

Hi @camertron

thanks for the feedback! Regarding the changeset: I already added one via npx changeset. Is it possible, that this is due to missing permissions as well?

[jonrohan]

nice change 👍🏻