Keep archive settings button on loading state after archiving

What does this MR do and why?

Keeps the archive button in a loading state after successfully archiving a group or project -- until it redirects to the next page.

Previously, the button returns to the normal state afterwards. There is a small window where you can re-click the button before the page redirects.

References

Related to #569365 (closed)

Screenshots or screen recordings

Before	After
Screen_Recording_2025-09-11_at_4.16.47_PM Note: Notice how I was able to click the archive button a second time	Screen_Recording_2025-09-11_at_4.22.06_PM

How to set up and validate locally

1. Enable archive_group feature flag
2. Go to Group/Project > Settings > General > Advanced > Archive

Notice that the button will stay on the loading state until it redirects.

MR acceptance checklist

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