Pipeline browser notifications using service workers

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Problem to solve

Browser notifications for pipeline statuses are only shown if GitLab is open in a tab.

Proposal

Use Service Workers to push pipeline status notifications even when GitLab isn't open in any tabs.

Intended users

• Sasha (Software Developer)

Further details

This would be particularly powerful if combined with something like this: #32929.

This would allow users to subscribe to specific pipelines and be notified when they finish, even if the user doesn't have any GitLab pages open.

A related feature request for todos: #33059