Bug-2003889: Return an appropriate message when lando is still loading

[moijes12]

Updated the response message in src/logic/treeherder.ts to convey to the user that lando has still not completed the try pushes.

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.26%. Comparing base (ec289b8) to head (892c5f0).

Files with missing lines	Patch %	Lines
src/logic/treeherder.ts	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1039      +/-   ##
==========================================
- Coverage   96.32%   96.26%   -0.06%     
==========================================
  Files         113      113              
  Lines        3262     3267       +5     
  Branches      739      740       +1     
==========================================
+ Hits         3142     3145       +3     
- Misses        118      120       +2     
  Partials        2        2              

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