Add tolerations for targetless agent. #13987

Job	Run time
check_if_release_branch	1s
towncrier_check	11s
changed_files	6s
build mirrord CLI	0s
lint	3m 26s
check-rust-docs	58s
macos_tests	24m 46s
integration_tests	8m 28s
test_agent	3m 34s
test_agent_image	6m 32s
test_cli_image	6m 31s
lint_markdown	0s
e2e (docker)	15m 4s
vscode_e2e_on_release_branch	0s
e2e (containerd)	13m 35s
intellij_e2e_on_release_branch	0s
ci	1s
	1h 23m 13s

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