[dalindev]

What was changed

test_custom_slot_supplier now runs a local activity too, records the reserved slot type on the permit, and checks the slot info fields on used and released slots: workflow type and sticky flag, activity type for both activity kinds, and Nexus service and operation.

Why?

The test only checked which slot kinds showed up in mark_slot_used, not the fields on the slot info, and it never ran a local activity. Activity and local activity slot infos have the same shape, so the old isinstance checks couldn't tell them apart either. The new checks run after the worker stops, because exceptions inside supplier callbacks are logged and swallowed, so asserting inside the callbacks could never fail the test.

Checklist

1. Closes [Feature Request] Ensure tests exist to confirm custom slot supplier slot info has proper fields #1079

2. How was this tested:
   poe test -k test_custom_slot_supplier --flake-finder --flake-runs=3 passes locally against the dev server (6 passed), and changing one expected value makes it fail as it should. poe lint passes.

3. Any docs updates needed?
   No. Test-only, so no changelog fragment.

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