feat(regionserver): add graceful shutdown configuration #1752

Job	Run time
Run Cargo Udeps	1m 20s
Check if committed Helm charts are up to date	52s
Check if committed README is the one we would render from the available parts	21s
Run Cargo Deny (advisories)	37s
Run Cargo Deny (bans licenses sources)	39s
Run RustDoc	1m 3s
Run Clippy	26s
Run Cargo Tests	41s
Run Rustfmt	12s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 50s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 13s
Build and publish manifest list	41s
Run the OpenShift Preflight check on the published images	14s
	27m 11s

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