fix: license headers & lint & test #1299

Job	Run time
integration-tests / Plan	4s
integration-tests / Build charm (jenkins-k8s)	8m 49s
integration-tests / Build rock (jenkins)	4m 36s
integration-tests / Plan Image Scanning	4s
integration-tests / Integration tests / Integration tests (test_auth_proxy.py)	17m 20s
integration-tests / Integration tests / Integration tests (test_cos.py)	17m 14s
integration-tests / Integration tests / Integration tests (test_ingress.py)	11m 50s
integration-tests / Integration tests / Integration tests (test_jenkins.py)	12m 26s
integration-tests / Integration tests / Integration tests (test_k8s_agent.py)	17m 6s
integration-tests / Integration tests / Integration tests (test_machine_agent.py)	14m 41s
integration-tests / Integration tests / Integration tests (test_plugins_part_1.py)	18m 31s
integration-tests / Integration tests / Integration tests (test_plugins_part_2.py)	17m 9s
integration-tests / Integration tests / Integration tests (test_proxy.py)	10m 43s
integration-tests / Integration tests / Integration tests (test_upgrade.py)	11m 15s
integration-tests / Integration tests / Integration tests (test_external_agent.py)	15m 53s
integration-tests / Scan Image (ghcr.io-canonical-jenkins-46499b77ce3a525fd8366c7e0fc694a8234c53dd-_1.0_amd64.tar)	1m 1s
integration-tests / Required Integration Test Status Checks	1s
	2h 58m 43s

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