feat(regionserver): add graceful shutdown configuration #1767

Job	Run time
Check if committed Helm charts are up to date	40s
Check if committed README is the one we would render from the available parts	20s
Run Cargo Deny (advisories)	40s
Run Cargo Deny (bans licenses sources)	41s
Run RustDoc	1m 7s
Run Clippy	28s
Run Rustfmt	12s
Run Cargo Tests	29s
Run Cargo Udeps	1m 19s
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 40s
Build and publish manifest list	39s
Run the OpenShift Preflight check on the published images	14s
	26m 40s

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