[UX] Add an API that returns projects that lack active fleets #6109

Job	Run time
compute-version	2s
build-docs / build-docs	1m 12s
build-artifacts / gateway-build	11s
build-artifacts / runner-test (macos-latest)	1m 36s
build-artifacts / runner-test (ubuntu-latest)	1m 8s
build-artifacts / code-lint	40s
build-artifacts / frontend-build	1m 51s
build-artifacts / generate-json-schema	23s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	33s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	32s
build-artifacts / python-build	20s
build-artifacts / python-test (macos-latest, 3.13)	2m 23s
build-artifacts / python-test (macos-latest, 3.12)	3m 32s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 51s
build-artifacts / python-test (macos-latest, 3.11)	3m 38s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 54s
build-artifacts / python-test (macos-latest, 3.9)	2m 24s
build-artifacts / python-test (windows-latest, 3.10)	2m 10s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 29s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 51s
build-artifacts / python-test (windows-latest, 3.9)	2m 14s
build-artifacts / python-test (windows-latest, 3.13)	2m 8s
build-artifacts / python-test (windows-latest, 3.11)	1m 54s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 51s
build-artifacts / python-test (windows-latest, 3.12)	2m 44s
build-artifacts / python-test (macos-latest, 3.10)	3m 18s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	22s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	16s
	59m 27s

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