src/vs/server/node/remoteAgentEnvironmentImpl.ts/RemoteAgentEnvironmentChannel/_scanExtensions
class RemoteAgentEnvironmentChannel:	private async _scanExtensions(language: string, extensionDevelopmentPath?: string[]): Promise<IExtensionDescription[]> {
		// Ensure that the language packs are available

		const [builtinExtensions, installedExtensions, developedExtensions] = await Promise.all([
			this._scanBuiltinExtensions(language),
			this._scanInstalledExtensions(language),
			this._scanDevelopedExtensions(language, extensionDevelopmentPath)
		]);

		return dedupExtensions(builtinExtensions, installedExtensions, developedExtensions, this._logService);
	}