Add command to re-run all running tasks (#252212)

* Initial plan

* Implement re-run all running tasks command

Co-authored-by: anthonykim1 <[email protected]>

* Improve implementation with constants and better user feedback

Co-authored-by: anthonykim1 <[email protected]>

* Prevent awkward notification that closes terminal tab

* Format

* Remove menu registration for Rerun All Running Tasks command

Co-authored-by: meganrogge <[email protected]>

* Add completion feedback showing number of tasks restarted

Co-authored-by: meganrogge <[email protected]>

* address whitespace hygiene

* do not add unrequested notification.

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Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: anthonykim1 <[email protected]>
Co-authored-by: Anthony Kim <[email protected]>
Co-authored-by: meganrogge <[email protected]>