ci(temporal): cache test-server binary to fix temporal.download 429 flakes#382

Abhijeet Prasad (AbhiPrasad) merged 2 commits intomainbraintrustdata/braintrust-sdk-python:mainfrom

ci-cache-temporal-test-serverbraintrustdata/braintrust-sdk-python:ci-cache-temporal-test-serverCopy head branch name to clipboard