slack-22.0: allow vtorc recoveries to be disabled from startup (#18005)

[timvaillancourt]

Description

A slack-22.0 backport of v23 PR vitessio#18005

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[github-actions]

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If no action is taken within 7 days, this PR will be closed.

[github-actions]

This PR was closed because it has been stale for 7 days with no activity.