Adds prometheus export point to the agent pod. #13563

Job	Run time
towncrier_check	7s
check_if_release_branch	1s
changed_files	7s
build mirrord CLI	0s
test_agent	3m 28s
lint	1m 3s
check-rust-docs	1m 1s
integration_tests	10m 27s
macos_tests	15m 39s
lint_markdown	0s
test_agent_image	2m 17s
test_cli_image	16m 31s
vscode_e2e_on_release_branch	0s
intellij_e2e_on_release_branch	0s
e2e (docker)	13m 12s
e2e (containerd)	12m 42s
ci	1s
	1h 16m 36s

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