Remove DisruptionRollout

[clairecng]

What does this PR do?

• [X] Removes functionality
• [ ] Adds new functionality
• [ ] Alters existing functionality
• [ ] Fixes a bug
• [ ] Improves documentation or testing

Please briefly describe your changes as well as the motivation behind them:

This PR removes the disruption rollout functionality, per lack of usage.

Code Quality Checklist

• [x] The documentation is up to date.
• [ ] My code is sufficiently commented and passes continuous integration checks.
• [x] I have signed my commit (see Contributing Docs).

Testing

• [ ] I leveraged continuous integration testing
  • [ ] by depending on existing unit tests or end-to-end tests.
  • [ ] by adding new unit tests or end-to-end tests.
• [ ] I manually tested the following steps:
  • x
  • [ ] locally.
  • [ ] as a canary deployment to a cluster.