Update UnbrandedGeneratorVersion to 1.0.0-alpha.20260218.5

[azure-sdk]

This PR updates the UnbrandedGeneratorVersion property in eng/Packages.Data.props and the @typespec/http-client-csharp dependency in eng/packages/http-client-csharp/package.json to version 1.0.0-alpha.20260218.5.

Details

• TypeSpec commit that triggered this PR: microsoft/typespec@8d95a55

Changes

• Updated eng/Packages.Data.props UnbrandedGeneratorVersion property
• Updated eng/packages/http-client-csharp/package.json dependency version
• Ran npm install to update package-lock.json
• Ran eng/packages/http-client-csharp/eng/scripts/Generate.ps1 to regenerate test projects
• Generated emitter-package.json artifacts using tsp-client
• Regenerated SDK libraries using the unbranded emitter via dotnet msbuild /t:GenerateCode

This is an automated PR created by the TypeSpec publish pipeline.

[Copilot]

Pull request overview

This PR updates the repo’s pinned unbranded TypeSpec C# emitter version to 1.0.0-alpha.20260218.5 (and refreshes the corresponding temporary emitter package artifacts) so generation flows use the newer published emitter.

Changes:

• Bump UnbrandedGeneratorVersion in central props to 1.0.0-alpha.20260218.5.
• Update @typespec/http-client-csharp dependency version used by eng/packages/http-client-csharp.
• Refresh eng/http-client-csharp-emitter-package.json and its lockfile to align with the new emitter’s peer dependency set.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
eng/packages/http-client-csharp/package.json	Updates unbranded emitter dependency version used by the local TypeSpec C# package.
eng/http-client-csharp-emitter-package.json	Updates the temp emitter package to reference the new unbranded emitter and newer TypeSpec toolchain deps.
eng/http-client-csharp-emitter-package-lock.json	Updates the corresponding lockfile to match the updated temp emitter package deps.
eng/Packages.Data.props	Updates the UnbrandedGeneratorVersion property to the new alpha version.

Files not reviewed (1)

• eng/http-client-csharp-emitter-package-lock.json: Language not supported

Comments suppressed due to low confidence (1)

eng/packages/http-client-csharp/package.json:45

• package.json updates @typespec/http-client-csharp to 1.0.0-alpha.20260218.5, but the local package-lock.json in this folder is still pinned to 1.0.0-alpha.20260213.16 and the devDependencies remain on the older TypeSpec/Azure Tools versions. This will produce a non-reproducible install (and likely peer dependency conflicts) and contradicts the PR description that npm install was run. Please bump the relevant devDependencies to satisfy the new emitter’s peer deps (e.g., TypeSpec 1.9.x / rest+streams+versioning 0.79.x, and Azure Tools 0.65.x, plus any newly required peers like @typespec/sse) and regenerate eng/packages/http-client-csharp/package-lock.json accordingly.

    "@typespec/http-client-csharp": "1.0.0-alpha.20260218.5"
  },
  "devDependencies": {
    "@azure-tools/azure-http-specs": "0.1.0-alpha.35",
    "@azure-tools/typespec-autorest": "0.64.0",