Adds prometheus export point to the agent pod. #13963

Job	Run time
towncrier_check	9s
check_if_release_branch	1s
changed_files	7s
build mirrord CLI	0s
test_agent	3m 25s
check-rust-docs	1m 8s
integration_tests	12m 20s
lint	3m 50s
macos_tests	34m 3s
test_agent_image	2m 54s
test_cli_image	14m 42s
lint_markdown	0s
e2e (docker)	14m 44s
intellij_e2e_on_release_branch	0s
e2e (containerd)	12m 26s
vscode_e2e_on_release_branch	0s
ci	1s
	1h 39m 50s

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