Debt: use ipc to communicate with the auth dialog

[deepak1556]

Follow-up to #97199 , since executeJavaScript calls are hard to debug and they are just inline script evaluation that can easily break CSP.

1. We should change BrowserWindowConstructorOptions for the auth window

from

const opts: BrowserWindowConstructorOptions = {
			alwaysOnTop: true,
			skipTaskbar: true,
			resizable: false,
			width: 450,
			height: 220,
			show: true,
			title: 'VS Code',
			webPreferences: {
				nodeIntegration: true,
				webviewTag: true
			}
		};

to

const opts: BrowserWindowConstructorOptions = {
	alwaysOnTop: true,
	skipTaskbar: true,
	resizable: false,
	width: 450,
	height: 220,
	show: true,
	title: localize('authRequire', "Proxy Authentication Required"),
	webPreferences: {
	      sandbox: true,
               contextIsolation: true,
               preload: require.toUrl('vs/code/electron-browser/proxy/auth-preload.js')
	}
};

2. Setup ipc channel in the preload script

3. Replace executeJavaScript call in vs/code/electron-main/auth.ts with win.webContents.send

This will align well with #92164

/cc @bpasero once you setup a structure for how preload communication should look, we can adopt it here.

[cr1315]

Could you please change the opts.height to some number bigger by the way, maybe 320?
I can hardly find the submit button in our case..

[bpasero]

As discussed, the auth dialog should use IMainProcessService and channels to communicate with the main side. A good place to learn from is our issue reporter window.

[joaomoreno]

Let's do this on debt week.

[joaomoreno]

Pushing out, no rush here.

[deepak1556]

thanks @joaomoreno , agreed.