feat: generic bulk admin delete pattern

[iloveagent57]

Extend custom bulk deletion to LicenseEvent and SubscriptionLicenseSource models. ENT-10377

Testing considerations

• Include instructions for any required manual tests, and any manual testing that has
  already been performed.
• Include unit and a11y tests as appropriate
• Consider performance issues.
• Check that Database migrations are backwards-compatible

Post-review

Squash commits into discrete sets of changes

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[pwnage101]

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