Fix IPv4 and IPv6 casing in generated C# parameters

[Copilot]

Property-derived C# parameters were emitted as iPv4 and iPv6 instead of matching the normalized IPv4 and IPv6 property names.

• Parameter naming
  • Normalize leading IPv4/IPv6 parameter acronyms without affecting ordinary camel casing or embedded text.

public IPModel(string IPv4, string IPv6)

• Regression coverage
  • Cover IPv4/IPv6 names, exact names, standard acronyms, and non-leading matches.

• Fixes Fix Acronym Casing in Generated Parameters #11672

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[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-csharp@11673

commit: d444af6

[Copilot]

Pull request overview

This PR fixes a casing regression in the C# generator where property-derived parameter variable names for IPv4/IPv6 were being emitted as iPv4/iPv6 instead of the expected ipv4/ipv6, aligning parameter casing with normalized property names (e.g., IPv4, IPv6).

Changes:

• Add a targeted IPv4/IPv6 post-normalization step in ToVariableName to rewrite leading iPv4/iPv6 to ipv4/ipv6 only at word boundaries.
• Add regression tests covering IPv4/IPv6, standard acronym behavior, exact-name scenarios, and non-leading/non-boundary cases.
• Minor formatting fix in an existing test update expression (& ~).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/PropertyProviderTests.cs	Adds coverage verifying property-derived parameter declarations normalize IPv4/IPv6 and common acronym casing; includes a small formatting correction.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/test/StringExtensionsTests.cs	Adds unit tests for ToVariableName behavior specific to IPv4/IPv6 casing and boundary/non-boundary cases.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/Extensions/StringExtensions.cs	Implements the IPv4/IPv6 leading-acronym casing correction in ToVariableName after identifier normalization.

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