Enable manual dispatch of leia test workflow

[AaronFeledy]

This gives maintainers a "Run Workflow" button to run the leia tests. It also enables a rest endpoint so could potentially trigger these tests from the core repo on every release. It gets enabled in the Github UI once this is in main.

https://docs.github.com/en/actions/managing-workflow-runs-and-deployments/managing-workflow-runs/manually-running-a-workflow

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[pirog]

ahhh very nice! did not know about this. im going to keep this ticket open for now with a ping on @reynoldsalec. i def would be inclined to get push button stuff in all our repos and triggering on core pushes/deploys/etc would be slick

[reynoldsalec]

That sounds good to me; I guess we should merge here, then make a Core PR to try remotely triggering the tests. If that's all dandy we can deploy to all these services.