chore: remove 2.4 support (including JMX exporter) #2186

Job	Run time
Run Cargo Deny (advisories)	29s
Run Rustfmt	13s
Decide if Helm charts are pushed to the helm repository based on action trigger	2s
Run Cargo Udeps	1m 50s
Run Cargo Deny (bans licenses sources)	22s
Run Clippy	28s
Check if committed Helm charts are up to date	35s
Run Cargo Tests	34s
Run RustDoc	1m 13s
Check if committed README is the one we would render from the available parts	21s
All tests passed	3s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	11m 18s
Package Charts, Build Docker Image and publish them - ubuntu-latest	12m 19s
Build and publish manifest list	39s
Run the OpenShift Preflight check on the published images	24s
	30m 50s

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