feat: Add run_attempt to workflow_runs schema

[santhosh-fit]

Summary
This pull request adds the run_attempt property to the workflow_runs schema. This will give the ability to filter out re-runs(run_attempt>1) in the workflow runs metrics.

Changes
Updated repository_streams.py to include run_attempt in the schema definition of the workflow_runs stream.

Testing

1. Confirmed that Github REST API endpoint for workflow runs response returns run_attempt field in the response.
2. Tested the changes locally using Meltano to ensure the run_attempt field is correctly included in response and populated in the target.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[edgarrmondragon]

Thanks @santhosh-fit!