ci: use GitHub App token in integration-tests workflow#100

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

abhi-fix-integration-pr-workflowbraintrustdata/braintrust-sdk-python:abhi-fix-integration-pr-workflowCopy head branch name to clipboard