feat(regionserver): add graceful shutdown configuration #1899

Job	Run time
Check if committed README is the one we would render from the available parts	20s
Check if committed Helm charts are up to date	2m 17s
Run Cargo Deny (advisories)	42s
Run Clippy	1m 59s
Run Cargo Deny (bans licenses sources)	39s
Run RustDoc	2m 23s
Run Rustfmt	12s
Run Cargo Tests	2m 6s
Run Cargo Udeps	1m 59s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 26s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 43s
Build and publish manifest list	54s
Run the OpenShift Preflight check on the published images	11s
	33m 53s

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