feat(regionserver): add graceful shutdown configuration #1780

Job	Run time
Check if committed README is the one we would render from the available parts	19s
Check if committed Helm charts are up to date	35s
Run Cargo Deny (advisories)	42s
Run Clippy	32s
Run Cargo Deny (bans licenses sources)	41s
Run RustDoc	1m 10s
Run Rustfmt	14s
Run Cargo Tests	31s
Run Cargo Udeps	1m 19s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	9m 56s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	11m 59s
Build and publish manifest list	40s
Run the OpenShift Preflight check on the published images	13s
	28m 53s

Provide feedback