Adds prometheus export point to the agent pod. #13676

Job	Run time
check_if_release_branch	1s
changed_files	11s
towncrier_check	10s
build mirrord CLI	0s
test_agent	3m 21s
test_agent_image	2m 56s
lint	4m 34s
check-rust-docs	1m 0s
integration_tests	12m 14s
macos_tests	19m 45s
lint_markdown	0s
test_cli_image	14m 52s
e2e (docker)	10m 14s
intellij_e2e_on_release_branch	0s
e2e (containerd)	10m 29s
vscode_e2e_on_release_branch	0s
ci	1s
	1h 19m 48s

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