fixed r2 refetch interval

[vlad-heidi]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #776

Changes R2Client default refetch_interval from 3600s to 3300s to match S3Client.

R2 credentials expire at exactly 60 minutes. With the default set to 3600s, credentials expire before they can be refreshed, causing auth failures for any streaming job running longer than 1 hour.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80%. Comparing base (5913181) to head (3444164).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #777   +/-   ##
===================================
- Coverage    80%    80%   -0%     
===================================
  Files        52     52           
  Lines      7362   7362           
===================================
- Hits       5906   5905    -1     
- Misses     1456   1457    +1     

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