PMM-12284 Remove Alertmanager settings related test #4456

Job	Run time
lint	30s
FB UI tests / Backup Management Common and Locations UI tests / e2e tests: @bm-locations	12m 39s
FB UI tests / Backup Management MongoDB UI tests / e2e tests: @bm-mongo	36m 52s
FB UI tests / Instances UI tests / e2e tests: @instances-fb	10m 58s
FB UI tests / Alerting and Settings UI tests / e2e tests: @alerting-fb\|@settings-fb	14m 47s
FB UI tests / PGSM UI tests / e2e tests: @pgsm-pmm-integration	29m 12s
FB UI tests / PSMDB Arbiter Replica UI tests / e2e tests: @pmm-psmdb-arbiter-integration	9m 16s
FB UI tests / RBAC UI tests / Tests	3m 38s
FB UI tests / PGSS UI tests / e2e tests: @pgss-pmm-integration	13m 29s
FB UI tests / User with changed password UI tests / podman e2e tests: @user-password	5m 3s
FB UI tests / User with changed password UI tests / e2e tests: @user-password	6m 29s
	2h 22m 53s

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