feat(regionserver): add graceful shutdown configuration #1766

Job	Run time
Check if committed Helm charts are up to date	37s
Check if committed README is the one we would render from the available parts	23s
Run Clippy	25s
Run RustDoc	1m 4s
Run Cargo Deny (advisories)	38s
Run Rustfmt	12s
Run Cargo Deny (bans licenses sources)	37s
Run Cargo Tests	39s
Run Cargo Udeps	1m 27s
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 10s
Build and publish manifest list	41s
Run the OpenShift Preflight check on the published images	13s
	26m 17s

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