Add `InstanceOffer.backend_data` + reserved GCP A4 (#3209) #5680

Job	Run time
compute-version	2s
build-docs / build-docs	2m 18s
build-artifacts / frontend-build	8s
build-artifacts / gateway-build	13s
build-artifacts / runner-test (ubuntu-latest)	1m 2s
build-artifacts / runner-test (macos-latest)	1m 38s
build-artifacts / code-lint	51s
build-artifacts / python-build	25s
build-artifacts / python-test (macos-latest, 3.9)	3m 29s
build-artifacts / generate-json-schema	14s
build-artifacts / python-test (macos-latest, 3.12)	2m 15s
build-artifacts / python-test (macos-latest, 3.11)	2m 44s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 54s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 9s
build-artifacts / python-test (macos-latest, 3.10)	2m 6s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 2s
build-artifacts / python-test (windows-latest, 3.9)	2m 5s
build-artifacts / python-test (macos-latest, 3.13)	2m 27s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 3s
build-artifacts / python-test (windows-latest, 3.10)	2m 2s
build-artifacts / python-test (windows-latest, 3.12)	2m 7s
build-artifacts / python-test (windows-latest, 3.13)	2m 27s
build-artifacts / python-test (windows-latest, 3.11)	1m 53s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 28s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	34s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	39s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	18s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	17s
	52m 50s

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