fix(projects): Treat fetch failures as pending #15839

Job	Run time
Lint Rust Default Features	1m 37s
Test All Features (ubuntu-latest)	3m 9s
Setup build metadata	1s
Test Python	51s
Test (macos-latest)	2m 11s
Lint	3m 39s
Test (windows-latest)	6m 18s
Integration Tests	10m 50s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	7m 48s
Build Docker Image (relay)	26s
Publish Relay to DockerHub	0s
Sentry-Relay Integration Tests	12m 40s
self-hosted-end-to-end	13m 29s
Publish Relay to GCR	0s
Upload build artifacts to gocd	0s
	1h 2m 59s

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