Don't use privileged for targetless agent containers (#3041) #14026

Job	Run time
check_if_release_branch	1s
towncrier_check	7s
changed_files	7s
build mirrord CLI	0s
test_agent	3m 31s
integration_tests	12m 5s
lint	3m 27s
check-rust-docs	1m 6s
macos_tests	25m 25s
test_agent_image	6m 46s
test_cli_image	6m 30s
lint_markdown	0s
intellij_e2e_on_release_branch	0s
vscode_e2e_on_release_branch	0s
e2e (docker)	13m 45s
e2e (containerd)	14m 12s
ci	1s
	1h 27m 3s

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