Add tolerations for targetless agent. (#3033) #13994

Job	Run time
towncrier_check	11s
check_if_release_branch	1s
changed_files	10s
build mirrord CLI	0s
check-rust-docs	4m 31s
test_agent	3m 29s
integration_tests	15m 18s
macos_tests	36m 41s
test_agent_image	6m 32s
lint	13m 0s
test_cli_image	7m 50s
lint_markdown	0s
intellij_e2e_on_release_branch	0s
e2e (docker)	14m 46s
vscode_e2e_on_release_branch	0s
e2e (containerd)	14m 59s
ci	1s
	1h 57m 29s

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