feat(regionserver): add graceful shutdown configuration #1902

Job	Run time
Check if committed README is the one we would render from the available parts	26s
Check if committed Helm charts are up to date	43s
Run Cargo Deny (advisories)	36s
Run Clippy	27s
Run Cargo Deny (bans licenses sources)	37s
Run RustDoc	1m 5s
Run Rustfmt	11s
Run Cargo Tests	30s
Run Cargo Udeps	1m 25s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 9s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 22s
Build and publish manifest list	52s
Run the OpenShift Preflight check on the published images	12s
	26m 37s

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