Respect RequestLocalizationOptions.FallBackToParentUICultures for culture fallback

[Copilot]

• Fix JsonResourceManager constructors to work with the new string[] ResourcesPath
• Update old constructor taking string to wrap it in an array when calling new constructor
• Fix constructor taking string[] to properly chain to the main constructor
• Update test cases to use string[] for ResourcesPath
• All 45 unit tests + 5 functional tests passing

Original prompt

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This section details on the original issue you should resolve

<issue_title>Culture Fallback should respect FallBackToParentUICultures</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

@hishamco Injecting `IOptions` will introduce a breaking change, we need a way to make this happen without breaking changes, otherwise will go into `3.0.0`

• Fixes Culture Fallback should respect FallBackToParentUICultures #27

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[hishamco]

@copilot use RequestLocalizationOptions.FallBackToParentUICultures instead

[Copilot]

Done in 5e22a6b. Now using RequestLocalizationOptions.FallBackToParentUICultures via optional constructor injection, maintaining backward compatibility with the existing constructor.

[hishamco]

@copilot resolve the conflicts

[Copilot]

@copilot resolve the conflicts

Conflicts resolved in d2026ee. Fixed JsonResourceManager constructors to work with the new string[] ResourcesPath type from the merge, and updated tests accordingly. All 50 tests passing.