chore: remove 2.4 support (including JMX exporter) #2188

Job	Run time
Run Cargo Deny (advisories)	29s
Run Cargo Deny (bans licenses sources)	22s
Check if committed README is the one we would render from the available parts	25s
Run Rustfmt	16s
Run Clippy	37s
Run RustDoc	1m 15s
Run Cargo Tests	30s
Check if committed Helm charts are up to date	35s
Decide if Helm charts are pushed to the helm repository based on action trigger	4s
Run Cargo Udeps	1m 55s
All tests passed	2s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	10m 22s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 53s
Build and publish manifest list	39s
Run the OpenShift Preflight check on the published images	17s
	29m 41s

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