Add `InstanceOffer.backend_data` + reserved GCP A4 #5679

Job	Run time
compute-version	2s
build-docs / build-docs	1m 59s
build-artifacts / runner-test (ubuntu-latest)	55s
build-artifacts / runner-test (macos-latest)	1m 16s
build-artifacts / frontend-build	9s
build-artifacts / gateway-build	10s
build-artifacts / code-lint	1m 1s
build-artifacts / python-build	26s
build-artifacts / generate-json-schema	15s
build-artifacts / python-test (macos-latest, 3.12)	3m 2s
build-artifacts / python-test (macos-latest, 3.10)	2m 9s
build-artifacts / python-test (macos-latest, 3.13)	2m 21s
build-artifacts / python-test (macos-latest, 3.11)	2m 52s
build-artifacts / python-test (ubuntu-latest, 3.9)	3m 57s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 26s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 51s
build-artifacts / python-test (macos-latest, 3.9)	2m 37s
build-artifacts / python-test (windows-latest, 3.12)	2m 2s
build-artifacts / python-test (windows-latest, 3.10)	2m 2s
build-artifacts / python-test (ubuntu-latest, 3.12)	3m 48s
build-artifacts / python-test (ubuntu-latest, 3.11)	3m 54s
build-artifacts / python-test (windows-latest, 3.9)	1m 55s
build-artifacts / python-test (windows-latest, 3.13)	2m 24s
build-artifacts / python-test (windows-latest, 3.11)	2m 10s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	52s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	41s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	15s
	51m 45s

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