url: align default argument handling for URLPattern with webidl

[panva]

Aligns URLPattern's argument handling with WebIDL semantics (to some extent at least), matching browser behavior (verified against Chrome):

Constructor:

• undefined/null for URLPatternInput (arg0) uses default empty init per WebIDL union-with-dictionary rules.
• 2-arg calls: overload resolution picks overload 2 (input, options) when arg1 is not a string, so null/undefined resolve to default options rather than being treated as baseURL.
• 3-arg calls: null/undefined for baseURL (USVString) are stringified to "null"/"undefined" per WebIDL, which ada rejects as invalid URLs.
• null/undefined for options dictionary uses defaults.

test() / exec():

• null/undefined for input uses default empty init.
• null for baseURL is stringified to "null" per WebIDL USVString conversion, letting the underlying library handle the error semantics (dict input + baseURL throws; string input + invalid baseURL returns no match).

ignoreCase:

• Changed from strict IsBoolean() type check to BooleanValue() coercion per WebIDL dictionary boolean member rules.

Tests:

• Updated WPT fixtures to f07c03cbed.
• Added tests for all undefined/null/coercion cases in test/parallel/test-urlpattern-types.js.

[nodejs-github-bot]

Review requested:

• @nodejs/web-standards
• @nodejs/url

[codecov]

Codecov Report

❌ Patch coverage is 93.02326% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.79%. Comparing base (dfe438d) to head (5e0f948).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_url_pattern.cc	93.02%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62719      +/-   ##
==========================================
- Coverage   89.81%   89.79%   -0.02%     
==========================================
  Files         699      699              
  Lines      216379   216395      +16     
  Branches    41366    41376      +10     
==========================================
- Hits       194340   194321      -19     
- Misses      14139    14150      +11     
- Partials     7900     7924      +24     

Files with missing lines	Coverage Δ
src/node_url_pattern.cc	83.72% <93.02%> (-1.07%)	⬇️

... and 29 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/72669/