Remove DisruptionRollout

[clairecng]

What does this PR do?

• 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

• The documentation is up to date.
• My code is sufficiently commented and passes continuous integration checks.
• 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.

[aymericDD]

Can you remove the disruptionRolloutEnabled parameter in the chart/values.yaml file? Otherwise LGTM 👍