Remove merge queue parsing

[codykaup]

In order to improve merge queue support, we want to pass the real branch name to the API. This removes merge queue branch parsing to account for that.

📦 Published PR as canary version: 16.1.0--canary.1256.23509139867.0

✨ Test out this PR locally via:

npm install chromatic@16.1.0--canary.1256.23509139867.0
# or 
yarn add chromatic@16.1.0--canary.1256.23509139867.0

[github-actions]

📦 Package Size: 5732 KB
✅ Compared to main: 0 KB c175ff8 (5732 KB)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.27%. Comparing base (c175ff8) to head (33a079e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1256      +/-   ##
==========================================
+ Coverage   72.22%   72.27%   +0.04%     
==========================================
  Files         208      207       -1     
  Lines        7918     7888      -30     
  Branches     1435     1431       -4     
==========================================
- Hits         5719     5701      -18     
+ Misses       2177     2165      -12     
  Partials       22       22              

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