Upgrade @azure-tools/typespec-client-generator-core to 0.63.3 for http-client-csharp

[Copilot]

Bumps TCGC dependency from 0.63.0 to 0.63.3 for http-client-csharp emitter. Version 0.63.3 includes new features and bug fixes from versions 0.63.1, 0.63.2, and 0.63.3.

Changes

• http-client-csharp: Updated devDependencies to 0.63.3 and peerDependencies lower bound to >=0.63.3
• Regenerated test files: Ran eng/scripts/Generate.ps1 to regenerate 39 tspCodeModel.json test files with updated crossLanguageDefinitionId values that reflect TCGC 0.63.1's new multi-service client support
• http-client-python: No changes (upgrade not needed)
• http-client-java: Already at 0.63.1, no changes needed

All changes are scoped to the http-client-csharp package only.

TCGC Version Changes

• 0.63.1: Adds support for generating a single client from multiple services
• 0.63.2: Fixes @hierarchyBuilding decorator to recognize envelope properties
• 0.63.3: Fixes wrong filtering of preview version value in version enum

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade to latest tcgc version</issue_title>
<issue_description>Version 0.63.1 of TCGC was released: https://github.com/Azure/typespec-azure/blob/main/packages/typespec-client-generator-core/CHANGELOG.md#0631.

This issue covers bumping the emitter's dependency version and related package.</issue_description>

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

• Fixes Upgrade to latest tcgc version #9250

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[jorgerangel-msft]

@copilot - there are regeneration failures in CI. You will need to rerun the eng/scripts/Generate.ps1 script and check in the updated files.

[Copilot]

@copilot - there are regeneration failures in CI. You will need to rerun the eng/scripts/Generate.ps1 script and check in the updated files.

Ran eng/scripts/Generate.ps1 and checked in the regenerated tspCodeModel.json files in commit adb920c.