feat: add --no-auth flag to api command for unauthenticated requests

[WilliamBergamin]

Changelog

Add --no-auth flag to the api command, allowing users to call Slack API methods that don't require authentication.

Summary

Some Slack API methods don't require authentication. Previously, the api command always resolved a token, failing if none was available, even when calling methods that don't need one. This prevents users from using publicly accessible endpoints.

This PR adds a --no-auth flag that skips token resolution entirely and sends the request without a token.

Preview

Testing

slack api blocks.validate --no-auth blocks='[{"type":"section","text":{"type":"mrkdwn","text":"Hello"}}]'

slack api api.test --no-auth

Notes

None

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 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.72%. Comparing base (c693443) to head (ac3ebc5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/api/api.go	89.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
+ Coverage   71.66%   71.72%   +0.06%     
==========================================
  Files         226      226              
  Lines       19115    19128      +13     
==========================================
+ Hits        13699    13720      +21     
+ Misses       4209     4205       -4     
+ Partials     1207     1203       -4     

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