azure-devops-node-api version: 10.2.1

Issue Description

global.window gets set in electron-link bundled applications, but global.window.navigator won't exist because it isn't a browser app, it's a node app. This means the current isBrowser check isn't quite enough, and the WebApi constructor will fail while trying to set the userAgent by accessing an undefined window.navigator.userAgent. I think a simple fix would be to also check window.navigator exists when calculating isBrowser.

Expected behaviour

isBrowser should not be true for electron-link (or any electron bundled) node apps.

Actual behaviour

isBrowser is true for electron-link (or possibly other electron bundled) node apps.