Disable LEGACY_REPO_DIR with feature flag #5836

Job	Run time
compute-version	3s
build-docs / build-docs	1m 9s
build-artifacts / frontend-build	8s
build-artifacts / runner-test (ubuntu-latest)	53s
build-artifacts / gateway-build	13s
build-artifacts / runner-test (macos-latest)	1m 40s
build-artifacts / code-lint	45s
build-artifacts / generate-json-schema	19s
build-artifacts / python-build	22s
build-artifacts / python-test (macos-latest, 3.9)	2m 55s
build-artifacts / python-test (macos-latest, 3.13)	2m 12s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 8s
build-artifacts / python-test (macos-latest, 3.12)	3m 10s
build-artifacts / python-test (macos-latest, 3.10)	3m 35s
build-artifacts / python-test (windows-latest, 3.10)	1m 42s
build-artifacts / python-test (windows-latest, 3.9)	1m 42s
build-artifacts / python-test (ubuntu-latest, 3.10)	3m 56s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 23s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 58s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 17s
build-artifacts / python-test (windows-latest, 3.13)	2m 16s
build-artifacts / python-test (macos-latest, 3.11)	3m 14s
build-artifacts / python-test (windows-latest, 3.11)	2m 9s
build-artifacts / python-test (windows-latest, 3.12)	2m 40s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	37s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	35s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	22s
	53m 37s

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