fix retry bug and blocking bug

[drmorr0]

• [x] I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

Description

• Fix the "retry" bug -- if the simulation PostStop hooks failed for whatever reason (e.g., if they're trying to clean up and the thing they're cleaning up is already gone), the simulation would get into an endless retry loop. We move the PostStop hooks logic into cleanup_simulation and move the PreStart hooks logic into setup_simulation for parallelity, which is totally a word.
• If multiple sims were scheduled simultaneously, it never actually returned Blocked for the simulation state. We now check for (and try to claim) the lease in fetch_driver_status instead of setup_simulation to fix this bug.

Testing done

• Manual testing
• new tests added

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.03704% with 7 lines in your changes missing coverage. Please review.

Project coverage is 73.71%. Comparing base (4d6c37c) to head (aee5416).

Files	Patch %	Lines
ctrl/controller.rs	77.27%	5 Missing :warning:
lib/watch/dyn_obj_watcher.rs	0.00%	1 Missing :warning:
lib/watch/pod_watcher.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #119 +/- ## ========================================== + Coverage 73.23% 73.71% +0.48% ========================================== Files 39 39 Lines 2156 2184 +28 ========================================== + Hits 1579 1610 +31 + Misses 577 574 -3 ```

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