Use ~/.eg/wasm on host provider

[mathetake]

Follow up on #5466 to make Wasm caching work both on Linux and macOS with the host provider.

@zhaohuabing @arkodg

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 65.22%. Comparing base (e4d164e) to head (b252337).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/runner/runner.go	0.00%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (60.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5491      +/-   ##
==========================================
- Coverage   65.29%   65.22%   -0.08%     
==========================================
  Files         213      213              
  Lines       33990    33989       -1     
==========================================
- Hits        22193    22168      -25     
- Misses      10471    10489      +18     
- Partials     1326     1332       +6     

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