Add server-side validation for fleet configuration subtypes #7010

Job	Run time
compute-version	3s
build-docs / build-docs	1m 26s
build-artifacts / code-lint	47s
build-artifacts / gateway-build	11s
build-artifacts / runner-test (ubuntu-latest)	1m 12s
build-artifacts / runner-test (macos-latest)	1m 9s
build-artifacts / frontend-build	9s
build-artifacts / python-build	19s
build-artifacts / generate-json-schema	18s
build-artifacts / python-test (ubuntu-latest, 3.12)	5m 27s
build-artifacts / python-test (ubuntu-latest, 3.11)	7m 40s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 49s
build-artifacts / python-test (ubuntu-latest, 3.10)	5m 21s
build-artifacts / python-test (macos-latest, 3.12)	3m 3s
build-artifacts / python-test (macos-latest, 3.10)	3m 10s
build-artifacts / python-test (macos-latest, 3.11)	3m 31s
build-artifacts / python-test (macos-latest, 3.13)	3m 2s
build-artifacts / python-test (windows-latest, 3.12)	2m 36s
build-artifacts / python-test (windows-latest, 3.10)	2m 15s
build-artifacts / python-test (windows-latest, 3.13)	2m 21s
build-artifacts / python-test (windows-latest, 3.11)	2m 5s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	31s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	32s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	25s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	20s
	52m 42s

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