Replace `Instance.termination_reason` values with codes #6028

Job	Run time
compute-version	2s
build-docs / build-docs	1m 8s
build-artifacts / code-lint	43s
build-artifacts / frontend-build	8s
build-artifacts / gateway-build	13s
build-artifacts / runner-test (macos-latest)	1m 4s
build-artifacts / runner-test (ubuntu-latest)	57s
build-artifacts / python-build	25s
build-artifacts / generate-json-schema	22s
build-artifacts / python-test (macos-latest, 3.13)	2m 51s
build-artifacts / python-test (macos-latest, 3.12)	2m 54s
build-artifacts / python-test (windows-latest, 3.10)	2m 0s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 28s
build-artifacts / python-test (macos-latest, 3.9)	2m 39s
build-artifacts / python-test (macos-latest, 3.11)	3m 17s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 29s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 28s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 13s
build-artifacts / python-test (macos-latest, 3.10)	2m 59s
build-artifacts / python-test (windows-latest, 3.13)	2m 2s
build-artifacts / python-test (windows-latest, 3.11)	1m 59s
build-artifacts / python-test (windows-latest, 3.9)	1m 52s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 29s
build-artifacts / python-test (windows-latest, 3.12)	2m 3s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	32s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	29s
upload-pre-pypi-artifacts	0s
upload-post-pypi-artifacts	0s
	52m 46s

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