feat(regionserver): add graceful shutdown configuration #1965

Job	Run time
Run Cargo Deny (advisories)	43s
Check if committed Helm charts are up to date	1m 5s
Run Cargo Deny (bans licenses sources)	40s
Check if committed README is the one we would render from the available parts	28s
Run RustDoc	1m 27s
Run Clippy	48s
Run Rustfmt	11s
Run Cargo Tests	47s
Run Cargo Udeps	1m 43s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 25s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 39s
Build and publish manifest list	42s
Run the OpenShift Preflight check on the published images	16s
	28m 56s

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