Fix issue reporter not closing on submit and debounce submissions

[nrayburn-tech]

Debounces the issue reporter submissions, so that a double click doesn't submit two different issues.
Fixes the issue reporter not closing when an issue has been submitted successfully.

I tried to use the debounce decorator, but couldn't get it working correctly with a return value so I went with the Delayer.

Testing

1. Open the issue reporter and fill out the required info.
2. Click the submit/preview button multiple times quickly (less than 300ms between clicks). (if you have github authenticated already, it will create multiple issues when testing this)
3. Only a single issue should be submitted.
4. The issue reporter should now close.

This PR fixes #115857

Old Behavior

New Behavior

[RMacfarlane]

Hey @nrayburn-tech, thanks for submitting this!

The debounce is a great improvement! However, I don't think we want to close the reporter by default after the button is clicked. We can't guarantee that the issue has successfully been created on GitHub - we don't have any control after the API to open the browser is called, so though unlikely, there's a chance it could fail after that. To avoid losing data we keep the reporter open.

[nrayburn-tech]

I reverted the change, it should only have the debounce now and all other behavior the same.

I was just aiming for consistency between the cmd+enter and the button. cmd+enter closes, but clicking does not. (In both cases, if the github API is called successfully the issue reporter is closed. This is only relevant for the openExternal calls.)

vscode/src/vs/code/electron-sandbox/issue/issueReporterMain.ts

Line 359 in 134d9b1

this.previewButton.onDidClick(() => this.createIssue());

vscode/src/vs/code/electron-sandbox/issue/issueReporterMain.ts

Lines 384 to 389 in 134d9b1

	// Cmd/Ctrl+Enter previews issue and closes window
	if (cmdOrCtrlKey && e.keyCode === 13) {
	if (await this.createIssue()) {
	ipcRenderer.send('vscode:closeIssueReporter');
	}
	}

[RMacfarlane]

Thanks!