feat(regionserver): add graceful shutdown configuration #1751

Job	Run time
Run Cargo Deny (advisories)	40s
Run Cargo Udeps	1m 23s
Run Cargo Deny (bans licenses sources)	38s
Check if committed Helm charts are up to date	50s
Check if committed README is the one we would render from the available parts	21s
Run Clippy	29s
Run RustDoc	1m 11s
Run Rustfmt	10s
Run Cargo Tests	44s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 43s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	10m 11s
Build and publish manifest list	49s
Run the OpenShift Preflight check on the published images	12s
	28m 23s

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