Forbid running multinode tasks on non-cluster fleets #5790

Job	Run time
compute-version	3s
build-docs / build-docs	1m 46s
build-artifacts / frontend-build	12s
build-artifacts / code-lint	39s
build-artifacts / gateway-build	12s
build-artifacts / runner-test (macos-latest)	1m 20s
build-artifacts / runner-test (ubuntu-latest)	1m 1s
build-artifacts / generate-json-schema	17s
build-artifacts / python-build	28s
build-artifacts / python-test (macos-latest, 3.11)	3m 35s
build-artifacts / python-test (macos-latest, 3.12)	2m 35s
build-artifacts / python-test (macos-latest, 3.9)	3m 10s
build-artifacts / python-test (macos-latest, 3.13)	2m 33s
build-artifacts / python-test (macos-latest, 3.10)	3m 18s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 11s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 23s
build-artifacts / python-test (ubuntu-latest, 3.11)	3m 37s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 10s
build-artifacts / python-test (windows-latest, 3.10)	1m 49s
build-artifacts / python-test (windows-latest, 3.13)	2m 8s
build-artifacts / python-test (windows-latest, 3.11)	1m 59s
build-artifacts / python-test (windows-latest, 3.9)	1m 47s
build-artifacts / python-test (windows-latest, 3.12)	1m 56s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 53s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	34s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	36s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	20s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	17s
	52m 49s

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