refactor: Make json_path_match expr non-anonymous

[reswqa]

Caught a fish that slipped through the net. 😉

The next step is to expressify this one.

[codspeed-hq]

CodSpeed Performance Report

Merging #15682 will not alter performance

_{Comparing reswqa:json_path (ef9c970) with main (5e68541)}

Summary

✅ 22 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.33%. Comparing base (70b71da) to head (ef9c970).

Files	Patch %	Lines
...rates/polars-plan/src/dsl/function_expr/strings.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15682      +/-   ##
==========================================
- Coverage   81.33%   81.33%   -0.01%     
==========================================
  Files        1374     1374              
  Lines      176471   176472       +1     
  Branches     2544     2544              
==========================================
- Hits       143539   143537       -2     
- Misses      32450    32452       +2     
- Partials      482      483       +1     

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[ritchie46]

Just a few left. 👀