Handle BackendAuthError when getting project backends #6015

Job	Run time
compute-version	3s
build-docs / build-docs	1m 9s
build-artifacts / code-lint	49s
build-artifacts / frontend-build	12s
build-artifacts / runner-test (ubuntu-latest)	1m 2s
build-artifacts / runner-test (macos-latest)	1m 19s
build-artifacts / gateway-build	14s
build-artifacts / generate-json-schema	16s
build-artifacts / python-build	23s
build-artifacts / python-test (macos-latest, 3.9)	2m 28s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 53s
build-artifacts / python-test (macos-latest, 3.11)	3m 20s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 41s
build-artifacts / python-test (macos-latest, 3.12)	3m 21s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 42s
build-artifacts / python-test (macos-latest, 3.10)	2m 58s
build-artifacts / python-test (windows-latest, 3.10)	1m 42s
build-artifacts / python-test (macos-latest, 3.13)	2m 34s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 31s
build-artifacts / python-test (windows-latest, 3.9)	1m 47s
build-artifacts / python-test (windows-latest, 3.13)	1m 56s
build-artifacts / python-test (windows-latest, 3.12)	2m 8s
build-artifacts / python-test (windows-latest, 3.11)	2m 8s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 42s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	35s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	30s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	17s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	24s
	55m 4s

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