Ensure esbuild can be detected on windows

[philippjfr]

Fixes #7598

[philippjfr]

Test failure unrelated.

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 86.17%. Comparing base (461b66e) to head (0625e5f).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/io/compile.py	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7625      +/-   ##
==========================================
- Coverage   86.70%   86.17%   -0.53%     
==========================================
  Files         341      341              
  Lines       51770    51775       +5     
==========================================
- Hits        44888    44619     -269     
- Misses       6882     7156     +274     

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