Adds prometheus export point to the agent pod. #13548

Job	Run time
check_if_release_branch	1s
towncrier_check	7s
changed_files	6s
build mirrord CLI	0s
test_agent	3m 22s
check-rust-docs	1m 2s
lint	3m 32s
integration_tests	8m 47s
macos_tests	24m 36s
test_agent_image	6m 59s
test_cli_image	16m 16s
lint_markdown	0s
e2e (docker)	12m 51s
e2e (containerd)	11m 37s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
ci	1s
	1h 29m 17s

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