fix(intl): read weekday option in DateTimeFormat constructor

[Lokesh0224]

weekday option was incorrectly spelled as weekDay (camelCase) in FormatOptions::try_init, causing the option getter to never be called.
So this caused three failures:

constructor-options-order.js
constructor-options-throwing-getters.js
test-option-date-time-components.js

Fix: correct the option key from "weekDay" to "weekday" per ECMA-402 §11.5.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	50,539	50,545	+6
Ignored	1,426	1,426	0
Failed	998	992	-6
Panics	2	2	0
Conformance	95.42%	95.43%	+0.01%

Fixed tests (6):

test/intl402/DateTimeFormat/test-option-date-time-components.js (previously Failed)
test/intl402/DateTimeFormat/constructor-options-order.js (previously Failed)
test/intl402/DateTimeFormat/constructor-options-throwing-getters.js (previously Failed)
test/intl402/DateTimeFormat/constructor-options-style-conflict.js (previously Failed)
test/intl402/DateTimeFormat/constructor-options-order-timedate-style.js (previously Failed)
test/intl402/DateTimeFormat/constructor-options-invalid-explicit-components.js (previously Failed)

Tested main commit: 58a24587890677d94618259dfaa5f257ab5ef9c9
Tested PR commit: 7ad8b6d295049a71a4c417852cc3672c7828ab5a
Compare commits: 58a2458...7ad8b6d

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.80%. Comparing base (6ddc2b4) to head (7ad8b6d).
⚠️ Report is 914 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5206       +/-   ##
===========================================
+ Coverage   47.24%   59.80%   +12.56%     
===========================================
  Files         476      582      +106     
  Lines       46892    63460    +16568     
===========================================
+ Hits        22154    37955    +15801     
- Misses      24738    25505      +767     

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[nekevss]

Huh, nice catch!