Add tests from WPT and fix them in the Console

[hansl]

Also added as_regexp() in JsValue as I needed it for the boa_wpt branch. Merged that in this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 82.66667% with 13 lines in your changes missing coverage. Please review.

Project coverage is 52.02%. Comparing base (6ddc2b4) to head (4dd3571).
Report is 258 commits behind head on main.

Files with missing lines	Patch %	Lines
core/runtime/src/console/mod.rs	89.85%	7 Missing ⚠️
core/engine/src/value/mod.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3979      +/-   ##
==========================================
+ Coverage   47.24%   52.02%   +4.78%     
==========================================
  Files         476      468       -8     
  Lines       46892    45329    -1563     
==========================================
+ Hits        22154    23584    +1430     
+ Misses      24738    21745    -2993     

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[raskad]

Looks good!