Adds prometheus export point to the agent pod. #13936

Job	Run time
check_if_release_branch	1s
towncrier_check	8s
changed_files	10s
build mirrord CLI	0s
check-rust-docs	1m 11s
test_agent	3m 30s
lint	3m 55s
test_agent_image	6m 28s
integration_tests	12m 7s
macos_tests	19m 7s
test_cli_image	7m 23s
lint_markdown	0s
e2e (docker)	14m 48s
vscode_e2e_on_release_branch	0s
e2e (containerd)	14m 44s
intellij_e2e_on_release_branch	0s
ci	1s
	1h 23m 33s

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