fix: restore GetChangeRevision API method

[dudinea]

Removal of GetChangeRevision API method broke ACR controller.
This PR restores this function.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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