Adds prometheus export point to the agent pod. #13557

Job	Run time
check_if_release_branch	1s
towncrier_check	9s
changed_files	6s
build mirrord CLI	0s
test_agent_image	3m 48s
test_agent	3m 29s
integration_tests	3m 53s
check-rust-docs	58s
lint	1m 4s
test_cli_image	3m 55s
macos_tests	3m 54s
lint_markdown	0s
vscode_e2e_on_release_branch	1s
intellij_e2e_on_release_branch	1s
e2e	1s
ci	1s
	21m 21s

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