Sitemaps: Rebuild button in JP Debugger

[wigglemuff]

In support, we may need to suggest rebuilding the sitemap to take on a change and currently there is not a direct way to do this besides cycling the module. A rebuild button would allow for a more obvious and friendly experience.

cc: @kraftbj

[stale]

This issue has been marked as stale. This happened because:

• It has been inactive in the past 6 months.
• It hasn’t been labeled `[Pri] Blocker`, `[Pri] High`.

No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.