Improve batch action modal loading state

[ohltyler]

Issue #, if available: #212

Description of changes:

This PR improves the handling of different cases while the batch action detector modals are in loading state.

Specifically:

1. Removes the Cancel button when loading
2. Adds functionality to the x to close the modal when loading
3. Adds a function parameter to the modals to differ between when a user is confirming the action (putting the modal in loading state) versus just closing the modal.

Screenshot of the delete batch action modal (before):

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