Fix for-in loops over arrays in tasks

Part of #79432

src/vs/workbench/contrib/tasks/browser/terminalTaskSystem.ts

@@ -340,9 +340,7 @@ export class TerminalTaskSystem implements ITaskSystem {
 	private async executeTask(task: Task, resolver: ITaskResolver, trigger: string): Promise<ITaskSummary> {
 		let promises: Promise<ITaskSummary>[] = [];
 		if (task.configurationProperties.dependsOn) {
-			// tslint:disable-next-line: no-for-in-array
-			for (let index in task.configurationProperties.dependsOn) {
-				const dependency = task.configurationProperties.dependsOn[index];
+			for (const dependency of task.configurationProperties.dependsOn) {
 				let dependencyTask = resolver.resolve(dependency.workspaceFolder, dependency.task!);
 				if (dependencyTask) {
 					let key = dependencyTask.getMapKey();

src/vs/workbench/contrib/tasks/common/tasks.ts

@@ -985,15 +985,14 @@ export namespace KeyedTaskIdentifier {
 	function sortedStringify(literal: any): string {
 		const keys = Object.keys(literal).sort();
 		let result: string = '';
-		// tslint:disable-next-line: no-for-in-array
-		for (let position in keys) {
-			let stringified = literal[keys[position]];
+		for (const key of keys) {
+			let stringified = literal[key];
 			if (stringified instanceof Object) {
 				stringified = sortedStringify(stringified);
 			} else if (typeof stringified === 'string') {
 				stringified = stringified.replace(/,/g, ',,');
 			}
-			result += keys[position] + ',' + stringified + ',';
+			result += key + ',' + stringified + ',';
 		}
 		return result;
 	}