Add server-side validation for fleet configuration subtypes #7009

Job	Run time
compute-version	4s
build-docs / build-docs	1m 21s
build-artifacts / frontend-build	13s
build-artifacts / code-lint	44s
build-artifacts / gateway-build	11s
build-artifacts / runner-test (macos-latest)	1m 14s
build-artifacts / runner-test (ubuntu-latest)	1m 2s
build-artifacts / generate-json-schema	16s
build-artifacts / python-build	22s
build-artifacts / python-test (macos-latest, 3.11)	3m 27s
build-artifacts / python-test (windows-latest, 3.10)	2m 4s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 30s
build-artifacts / python-test (macos-latest, 3.10)	3m 17s
build-artifacts / python-test (macos-latest, 3.12)	3m 57s
build-artifacts / python-test (macos-latest, 3.13)	3m 53s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 24s
build-artifacts / python-test (windows-latest, 3.11)	2m 5s
build-artifacts / python-test (ubuntu-latest, 3.12)	5m 31s
build-artifacts / python-test (windows-latest, 3.12)	2m 11s
build-artifacts / python-test (ubuntu-latest, 3.10)	5m 41s
build-artifacts / python-test (windows-latest, 3.13)	3m 44s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	33s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	28s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	16s
	51m 42s

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