Adds prometheus export point to the agent pod. #13935

Job	Run time
check_if_release_branch	1s
changed_files	7s
towncrier_check	7s
build mirrord CLI	0s
test_agent	3m 21s
lint	3m 43s
check-rust-docs	1m 8s
integration_tests	10m 5s
macos_tests	10m 5s
test_agent_image	6m 30s
test_cli_image	6m 30s
lint_markdown	0s
e2e (docker)	3m 29s
vscode_e2e_on_release_branch	0s
intellij_e2e_on_release_branch	0s
e2e (containerd)	3m 27s
ci	1s
	48m 34s

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