wait for task system info before running any task

[meganrogge]

When I reproduce the issue, here's the output I see: #173384 (comment)

vscode/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts

Line 2129 in 5a82dbd

'Warning: {0} tasks are unavailable in the current environment.\n',

vscode/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts

Line 2363 in 5a82dbd

problemReporter.fatal(nls.localize('TaskSystem.workspaceFolderError', 'Workspace folder was undefined'));

and those lines are reached if we try to get the workspace tasks before this has happened

vscode/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts

Lines 653 to 661 in 5a82dbd

	public registerTaskSystem(key: string, info: ITaskSystemInfo): void {
	// Ideally the Web caller of registerRegisterTaskSystem would use the correct key.
	// However, the caller doesn't know about the workspace folders at the time of the call, even though we know about them here.
	if (info.platform === Platform.Platform.Web) {
	key = this.workspaceFolders.length ? this.workspaceFolders[0].uri.scheme : key;
	}
	if (!this._taskSystemInfos.has(key)) {
	this._taskSystemInfos.set(key, [info]);
	} else {

so we now will do for runTask, runBuildTask, and reconnectTasks what runAutomaticTasks does to avoid such issues

vscode/src/vs/workbench/contrib/tasks/browser/runAutomaticTasks.ts

Lines 47 to 51 in 5a82dbd

	// Wait until we have task system info (the extension host and workspace folders are available).
	if (!this._taskService.hasTaskSystemInfo) {
	this._logService.trace('RunAutomaticTasks: Awaiting task system info.');
	await Event.toPromise(Event.once(this._taskService.onDidChangeTaskSystemInfo));
	}

fix #173384