Add Un-reserve extension point for the scheduling framework #77598
What type of PR is this?
What this PR does / why we need it:
Add Un-reserve extension point for the scheduling framework
Which issue(s) this PR fixes:
Special notes for your reviewer:
This PR reintroduce Un-reserve extension point and fix the
Does this PR introduce a user-facing change?:
[APPROVALNOTIFIER] This PR is APPROVED
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