Add tolerations for targetless agent. #13993

Job	Run time
check_if_release_branch	1s
towncrier_check	10s
changed_files	10s
build mirrord CLI	0s
test_agent	3m 27s
macos_tests	32m 36s
lint	3m 28s
check-rust-docs	58s
integration_tests	14m 39s
test_cli_image	6m 45s
test_agent_image	6m 31s
lint_markdown	0s
vscode_e2e_on_release_branch	0s
e2e (docker)	13m 37s
intellij_e2e_on_release_branch	0s
e2e (containerd)	12m 36s
ci	1s
	1h 34m 59s

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