feat(regionserver): add graceful shutdown configuration #1901

Job	Run time
Check if committed Helm charts are up to date	46s
Check if committed README is the one we would render from the available parts	25s
Run Clippy	29s
Run Cargo Deny (advisories)	38s
Run Cargo Deny (bans licenses sources)	39s
Run RustDoc	1m 5s
Run Rustfmt	10s
Run Cargo Udeps	1m 21s
Run Cargo Tests	32s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	9m 57s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 26s
Build and publish manifest list	38s
Run the OpenShift Preflight check on the published images	11s
	26m 19s

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