Adds prometheus export point to the agent pod. #13956

Job	Run time
check_if_release_branch	1s
changed_files	10s
towncrier_check	8s
build mirrord CLI	0s
check-rust-docs	1m 7s
lint	3m 40s
lint_markdown	0s
integration_tests	12m 24s
macos_tests	31m 29s
test_agent	3m 21s
test_agent_image	7m 0s
test_cli_image	6m 45s
vscode_e2e_on_release_branch	0s
intellij_e2e_on_release_branch	0s
e2e (docker)	14m 45s
e2e (containerd)	12m 37s
ci	1s
	1h 33m 28s

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