[UX] Add an API that returns projects that lack active fleets #6083

Job	Run time
compute-version	3s
build-docs / build-docs	1m 19s
build-artifacts / code-lint	47s
build-artifacts / frontend-build	8s
build-artifacts / runner-test (macos-latest)	41s
build-artifacts / runner-test (ubuntu-latest)	28s
build-artifacts / gateway-build	10s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	25s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	26s
build-artifacts / generate-json-schema	17s
build-artifacts / python-build	23s
build-artifacts / python-test (macos-latest, 3.12)	3m 15s
build-artifacts / python-test (macos-latest, 3.13)	2m 51s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 13s
build-artifacts / python-test (macos-latest, 3.9)	3m 6s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 49s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 50s
build-artifacts / python-test (macos-latest, 3.11)	3m 0s
build-artifacts / python-test (windows-latest, 3.9)	1m 54s
build-artifacts / python-test (macos-latest, 3.10)	2m 52s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 16s
build-artifacts / python-test (windows-latest, 3.13)	2m 21s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 40s
build-artifacts / python-test (windows-latest, 3.10)	1m 53s
build-artifacts / python-test (windows-latest, 3.11)	2m 8s
build-artifacts / python-test (windows-latest, 3.12)	2m 3s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	22s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	18s
	53m 58s

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