Adds prometheus export point to the agent pod. #13954

Job	Run time
changed_files	6s
check_if_release_branch	1s
towncrier_check	8s
build mirrord CLI	0s
check-rust-docs	4m 23s
integration_tests	14m 35s
lint	13m 13s
lint_markdown	0s
macos_tests	22m 27s
test_agent	3m 38s
test_agent_image	6m 51s
test_cli_image	14m 37s
e2e (docker)	12m 12s
vscode_e2e_on_release_branch	0s
intellij_e2e_on_release_branch	0s
e2e (containerd)	12m 0s
ci	1s
	1h 44m 12s

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