Optimize Transcript Fetching for Rate-Limited Meetings

Reduced HTTP requests for rate-limited transcript fetches to improve efficiency.

Changes

• Set maxAttempts to 1 in GranolaSyncProvider.fetchTranscript for backfill operations.
• Eliminated unnecessary retries for rate-limited transcripts, reducing sleep time by 6 seconds per meeting.
• Maintained default maxAttempts of 3 for normal sync behavior to preserve existing functionality.