[GCP] Make `tpu` an opt-in option in the backend configuration #6510

Job	Run time
compute-version	3s
build-docs / build-docs	1m 15s
build-artifacts / code-lint	43s
build-artifacts / runner-test (ubuntu-latest)	1m 9s
build-artifacts / gateway-build	10s
build-artifacts / runner-test (macos-latest)	54s
build-artifacts / frontend-build	8s
build-artifacts / python-build	19s
build-artifacts / generate-json-schema	19s
build-artifacts / python-test (macos-latest, 3.11)	4m 12s
build-artifacts / python-test (macos-latest, 3.12)	2m 44s
build-artifacts / python-test (macos-latest, 3.10)	4m 12s
build-artifacts / python-test (macos-latest, 3.9)	2m 32s
build-artifacts / python-test (ubuntu-latest, 3.9)	6m 3s
build-artifacts / python-test (ubuntu-latest, 3.13)	5m 30s
build-artifacts / python-test (windows-latest, 3.12)	4m 30s
build-artifacts / python-test (macos-latest, 3.13)	3m 33s
build-artifacts / python-test (windows-latest, 3.9)	2m 59s
build-artifacts / python-test (windows-latest, 3.10)	2m 11s
build-artifacts / python-test (windows-latest, 3.11)	2m 11s
build-artifacts / python-test (ubuntu-latest, 3.11)	6m 5s
build-artifacts / python-test (windows-latest, 3.13)	2m 13s
build-artifacts / python-test (ubuntu-latest, 3.12)	5m 24s
build-artifacts / python-test (ubuntu-latest, 3.10)	6m 7s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	32s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	34s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	20s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	15s
	1h 7m 7s

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