claim: Update logic to check whether a commenter is a contributor.

[Varun-Kolanu]

Fixes #230.

Previous logic fetched all contributors in the repo and checked whether the commenter is a contributor or not.
The present logic fetches the commits of the commenter directly in the repo and checks whether they are contributor by verifying that number of commits are atleast one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.37%. Comparing base (3655e1f) to head (644223a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #242      +/-   ##
==========================================
+ Coverage   64.25%   64.37%   +0.12%     
==========================================
  Files          23       23              
  Lines        1757     1763       +6     
==========================================
+ Hits         1129     1135       +6     
  Misses        628      628              

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[Varun-Kolanu]

@laurynmm Could you please review when free?

[timabbott]

This does seem like better logic -- certainly a much cheaper query. How have you tested it?

[Varun-Kolanu]

Thanks!

Yeah, I tested it by setting up the bot locally using the Smee client and trying the feature on a test repo. When claiming with a username that had more than one commit, the fetch result correctly showed only one commit, and the issue was assigned as expected. And, when I used another username with no commits, the issue wasn't assigned.

[timabbott]

Merged, thanks @Varun-Kolanu!