Revert "Temporarily finalize getScopedEnvironmentVariableCollection"

This reverts commit 88799ca.

Author: Kartik Raj

src/vs/workbench/api/common/extHostExtensionService.ts

@@ -523,7 +523,8 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 					return that.extensionRuntime;
 				},
 				get environmentVariableCollection() {
-					return that._extHostTerminalService.getEnvironmentVariableCollection(extensionDescription);
+					// TODO: Remove `as` cast once workspace collection proposal is finalized.
+					return (that._extHostTerminalService.getEnvironmentVariableCollection(extensionDescription) as vscode.EnvironmentVariableCollection);
 				},
 				get messagePassingProtocol() {
 					if (!messagePassingProtocol) {

src/vs/workbench/api/common/extHostTerminalService.ts

@@ -52,7 +52,7 @@ export interface IExtHostTerminalService extends ExtHostTerminalServiceShape, ID
 	registerTerminalQuickFixProvider(id: string, extensionId: string, provider: vscode.TerminalQuickFixProvider): vscode.Disposable;
 	getEnvironmentVariableCollection(extension: IExtensionDescription): IDefaultEnvironmentVariableCollection;
 }
-type IDefaultEnvironmentVariableCollection = vscode.EnvironmentVariableCollection & { getScopedEnvironmentVariableCollection(scope: vscode.EnvironmentVariableScope | undefined): vscode.EnvironmentVariableCollection };
+type IDefaultEnvironmentVariableCollection = vscode.EnvironmentVariableCollection | { getScopedEnvironmentVariableCollection(scope: vscode.EnvironmentVariableScope | undefined): vscode.EnvironmentVariableCollection };
 export interface ITerminalInternalOptions {
 	isFeatureTerminal?: boolean;
 	useShellEnvironment?: boolean;

src/vscode-dts/vscode.d.ts

@@ -7163,7 +7163,7 @@ declare module 'vscode' {
 		 * Gets the extension's environment variable collection for this workspace, enabling changes
 		 * to be applied to terminal environment variables.
 		 */
-		readonly environmentVariableCollection: EnvironmentVariableCollection & { getScopedEnvironmentVariableCollection(scope: EnvironmentVariableScope): EnvironmentVariableCollection };
+		readonly environmentVariableCollection: EnvironmentVariableCollection;
 
 		/**
 		 * Get the absolute path of a resource contained in the extension.

src/vscode-dts/vscode.proposed.envCollectionWorkspace.d.ts

@@ -7,15 +7,15 @@ declare module 'vscode' {
 
 	// https://github.com/microsoft/vscode/issues/182069
 
-	export interface ExtensionContext {
-		/**
-		 * Gets the extension's environment variable collection for this workspace, enabling changes
-		 * to be applied to terminal environment variables.
-		 *
-		 * @param scope The scope to which the environment variable collection applies to.
-		 */
-		readonly environmentVariableCollection: EnvironmentVariableCollection & { getScopedEnvironmentVariableCollection(scope: EnvironmentVariableScope): EnvironmentVariableCollection };
-	}
+	// export interface ExtensionContext {
+	// 	/**
+	// 	 * Gets the extension's environment variable collection for this workspace, enabling changes
+	// 	 * to be applied to terminal environment variables.
+	// 	 *
+	// 	 * @param scope The scope to which the environment variable collection applies to.
+	// 	 */
+	// 	readonly environmentVariableCollection: EnvironmentVariableCollection | { getScopedEnvironmentVariableCollection(scope: EnvironmentVariableScope): EnvironmentVariableCollection };
+	// }
 
 	export type EnvironmentVariableScope = {
 		/**