Set INSTANCE_UNREACHABLE for unreachable on-demand instances #6248

Job	Run time
compute-version	3s
build-docs / build-docs	1m 18s
build-artifacts / code-lint	42s
build-artifacts / gateway-build	14s
build-artifacts / runner-test (macos-latest)	1m 21s
build-artifacts / frontend-build	7s
build-artifacts / runner-test (ubuntu-latest)	36s
build-artifacts / python-build	18s
build-artifacts / generate-json-schema	22s
build-artifacts / python-test (macos-latest, 3.11)	2m 42s
build-artifacts / python-test (macos-latest, 3.9)	2m 51s
build-artifacts / python-test (macos-latest, 3.12)	4m 1s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 15s
build-artifacts / python-test (macos-latest, 3.10)	2m 27s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 53s
build-artifacts / python-test (windows-latest, 3.10)	2m 9s
build-artifacts / python-test (windows-latest, 3.13)	2m 35s
build-artifacts / python-test (windows-latest, 3.12)	2m 15s
build-artifacts / python-test (macos-latest, 3.13)	3m 9s
build-artifacts / python-test (windows-latest, 3.9)	1m 56s
build-artifacts / python-test (ubuntu-latest, 3.11)	5m 5s
build-artifacts / python-test (ubuntu-latest, 3.10)	5m 5s
build-artifacts / python-test (windows-latest, 3.11)	2m 11s
build-artifacts / python-test (ubuntu-latest, 3.9)	5m 16s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	39s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	26s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	23s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	18s
	57m 37s

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