[http-client-csharp] Normalize Url suffixes on operations and enum values

[JoshLove-msft]

Summary

• normalize a complete Url suffix to Uri on operation names and fixed/extensible enum values
• leave embedded or non-suffix text unchanged
• preserve exact names and matching names from the last contract before applying normalization
• keep existing model and property behavior unchanged

Validation

• full Input, core generator, and ClientModel test projects
• C# emitter build
• Cop static analysis
• formatting and spelling checks

Related to Azure/azure-sdk-for-net#61945

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commit: 03f3d12

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[Copilot]

Pull request overview

Normalizes generated C# identifiers by replacing a complete Url suffix with Uri for operation names and enum value names, while preserving isExactName values and retaining names from the last contract to avoid breaking changes in the http-client-csharp generator.

Changes:

• Added ReplaceUrlSuffixWithUri string helper and unit tests for suffix normalization behavior.
• Updated enum value name generation (fixed + extensible) to apply Url→Uri normalization unless preserved by exact-name or last-contract matching.
• Updated client operation name cleaning to apply Url→Uri normalization unless preserved by exact-name or last-contract method names; refreshed related golden test data.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/src/Extensions/StringExtensions.cs	Adds ReplaceUrlSuffixWithUri helper used by generator naming.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.Input/test/StringExtensionsTests.cs	Adds tests covering Url→Uri suffix replacement cases.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/EnumProvider.cs	Centralizes enum value generated-name logic and applies suffix normalization with last-contract preservation.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/FixedEnumProvider.cs	Uses shared generated-name logic for fixed enums (including suffix normalization/back-compat).
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/ExtensibleEnumProvider.cs	Uses shared generated-name logic for extensible enums (including suffix normalization/back-compat).
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/EnumProviders/EnumProviderTests.cs	Adds coverage for enum value suffix normalization and last-contract preservation.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/EnumProviders/TestData/EnumProviderTests/BuildEnumType_PreservesUrlSuffixFromLastContract(Fixed)/MockInputEnum.cs	New last-contract test stub for fixed enum preserving Url suffix.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/EnumProviders/TestData/EnumProviderTests/BuildEnumType_PreservesUrlSuffixFromLastContract(Extensible)/MockInputEnum.cs	New last-contract test stub for extensible enum preserving Url suffix.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/src/Providers/ClientProvider.cs	Applies Url→Uri normalization to operation names with last-contract preservation.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/ClientProviderTests.cs	Adds tests for operation name normalization and last-contract preservation.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientProviders/TestData/ClientProviderTests/TestOperationNamePreservesUrlSuffixFromLastContract/TestClient.cs	New last-contract client stub to validate preserving GetUrl names.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/RestClientProviders/TestData/RestClientProviderTests/TestBuildCreateRequestMethodWithSlashQueryInPath.cs	Updates golden output to reflect ...FromUri... naming.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/RestClientProviders/TestData/RestClientProviderTests/TestBuildCreateRequestMethodWithQueryInPath.cs	Updates golden output to reflect ...FromUri... naming.

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