Handle BackendAuthError when getting project backends (#3393) #6016

Job	Run time
compute-version	3s
build-docs / build-docs	1m 18s
build-artifacts / runner-test (ubuntu-latest)	1m 1s
build-artifacts / gateway-build	12s
build-artifacts / code-lint	42s
build-artifacts / runner-test (macos-latest)	1m 0s
build-artifacts / frontend-build	12s
build-artifacts / generate-json-schema	16s
build-artifacts / python-build	18s
build-artifacts / python-test (macos-latest, 3.10)	3m 15s
build-artifacts / python-test (macos-latest, 3.11)	2m 32s
build-artifacts / python-test (macos-latest, 3.13)	3m 39s
build-artifacts / python-test (macos-latest, 3.9)	3m 12s
build-artifacts / python-test (macos-latest, 3.12)	3m 16s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 33s
build-artifacts / python-test (ubuntu-latest, 3.13)	3m 41s
build-artifacts / python-test (windows-latest, 3.13)	1m 51s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 26s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 42s
build-artifacts / python-test (windows-latest, 3.11)	2m 2s
build-artifacts / python-test (windows-latest, 3.10)	1m 45s
build-artifacts / python-test (windows-latest, 3.9)	1m 45s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 35s
build-artifacts / python-test (windows-latest, 3.12)	1m 52s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	41s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	36s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	13s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	22s
	54m 0s

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