Add bundle execution capabilities to Runner

[desertaxle]

This PR uses the utilities introduced in #17178 to outfit the Runner class to kick off and monitor the execution of a bundle. The Runner can handle cancellation and crash detection for flow runs initiated via bundle the same as if execution was kicked off by a normally scheduled run.

The execute_bundle method duplicates some logic because I want to move the Runner control flow towards one where we kick off subprocess via multiprocessing rather than subprocess. I think that flow is substantially easier to understand and should be possible with the run_flow_in_subprocess utility in a later PR.

Related to #17194

[codspeed-hq]

CodSpeed Performance Report

Merging #17192 will not alter performance

_{Comparing runner-execute-bundle (bbabdfb) with main (a476000)}

Summary

✅ 2 untouched benchmarks

[zzstoatzz]

woo!