Improve Azure startup time and fix command palette (#5761)

* Improve Azure startup time and fix command palette
- Improvement (but not full fix) for #4732 where Azure startup is very slow.
This speeds the startup by up to 5 seconds by
  - Changing from fixed 5 second initial wait time to a promise to check for accounts
  - Using the accounts changed notification to send a message when accounts are ready. This is usually what will "win out" since Azure seems to load before the Account Providers are set up.
- Remove right-click actions from the command palette.
- Rename Azure actions so it's clear what they are in the command palette.

* Remove coveralls task while investigating how to make optional task

* Add void return type

src/sql/workbench/services/accountManagement/browser/accountManagementService.ts

@@ -364,6 +364,8 @@ export class AccountManagementService implements IAccountManagementService {
 					addedProvider: provider.metadata,
 					initialAccounts: provider.accounts.slice(0)		// Slice here to make sure no one can modify our cache
 				});
+				// Notify listeners that the account has been updated
+				self.fireAccountListUpdate(provider, false);
 			});
 
 		// TODO: Add stale event handling to the providers