[MM-14093] Rename 'team' to 'server' and 'tab' to 'view' in most cases, some additional cleanup (#2711)

* Rename MattermostTeam -> UniqueServer, MattermostTab -> UniqueView

* Rename 'team' to 'server'

* Some further cleanup

* Rename weirdly named function

* Rename 'tab' to 'view' in most instances

* Fix i18n

* PR feedback

src/main/app/initialize.test.js

@@ -278,7 +278,7 @@ describe('main/app/initialize', () => {
 
         it('should allow permission requests for supported types from trusted URLs', async () => {
             ViewManager.getViewByWebContentsId.mockReturnValue({
-                tab: {
+                view: {
                     server: {
                         url: new URL('http://server-1.com'),
                     },