Option 3 - fixed - Update date formatting tests to handle culture specific formats

[Krishanthaudayakumara]

• Convert DateTagHelper unit tests to use InlineData pattern with multiple cultures (en-US, da-DK, uk-UA)
• Update integration tests to expect culture-aware date formatting instead of hardcoded US format
• Fix test failures when running with Danish (da-dk) culture where date separator changes from "/" to "-"
• Replace var declarations with explicit types in modified test methods
• Add System.Globalization using statements where needed

Files modified,

• DateTagHelperFixture.cs: Convert to multi-culture InlineData tests
• DateFieldTagHelperFixture.cs: Use CurrentCulture for date expectations
• AllFieldTagHelpersFixture.cs: Use CurrentCulture for date assertions
• RichTextFieldTagHelperFixture.cs: Handle culture-specific date formatting
• ViewFieldsBindingFixture.cs: Update date format expectations

[Krishanthaudayakumara]

Apologies for the confusion. I intended to open this PR within my fork, but mistakenly submitted it to the main repository. Please disregard this request.