Adds prometheus export point to the agent pod. #13565

Job	Run time
towncrier_check	11s
changed_files	6s
check_if_release_branch	1s
build mirrord CLI	0s
lint	48s
test_agent	3m 17s
integration_tests	9m 32s
check-rust-docs	59s
test_agent_image	2m 21s
test_cli_image	16m 49s
macos_tests	22m 54s
lint_markdown	0s
e2e (docker)	11m 52s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
e2e (containerd)	14m 18s
ci	1s
	1h 23m 9s

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