fix: avoid infinite loops when searching for filesystem root of another drive

[zimeg]

Changelog

We now avoid infinite loops when searching for the root project .slack directory for projects existing on drives other than the C: drive on Windows.

Summary

This PR follows #178 with ongoing attempt to exit hanging installations in CI. We now check for repeated lookups when searching "up" for the project .slack directory.

Reviewers

These changes were proven to work on Windows with slackapi/slack-github-action#560!

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.57%. Comparing base (54ba6d6) to head (7900769).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/shared/clients.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #353      +/-   ##
==========================================
+ Coverage   64.54%   64.57%   +0.02%     
==========================================
  Files         213      213              
  Lines       17915    17918       +3     
==========================================
+ Hits        11564    11570       +6     
+ Misses       5274     5272       -2     
+ Partials     1077     1076       -1     

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[hello-ashleyintech]

this has brought back many windows memories! 🙌

[hello-ashleyintech]

nice add 🙏

[zimeg]

@hello-ashleyintech I hope all good ones! Let's merge this to look out for more edge 📠