Minor VSCode workspace settings changes

[mbg]

Two small changes:

• One of the existing keys is deprecated. It is replaced with the new replacement key.
• Added the "tests" folder to the excluded paths. This contains a number of language-specific integration tests. The reason for excluding it from the workspace by default is because some language-specific VSCode extensions will detect files in that directory and start up automatically even if none of the files are opened. That adds start-up time, runs unnecessary background processes, and some of the extensions complain rather loudly that the test projects don't meet their expectations. Unfortunately, there's no way to disable the extensions (if installed) for the workspace in a configuration file.

[Copilot]

Copilot review overview

🟢 Approval recommended

The settings changes are valid and focused, with only a non-blocking wording correction noted.

Review effort: Balanced
Findings: 1

Open (1)

• Correct product name capitalization to VS Code · New

What changed in this PR

Updates workspace defaults to reduce unnecessary extension activation and use the current VS Code TypeScript SDK setting.

Changes:

• Excludes integration-test fixtures from the workspace.
• Replaces the deprecated TypeScript SDK key.

File	Description
.vscode/​settings.json	Updates workspace exclusions and TypeScript SDK configuration.

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