Add token expiration handling for AzureMFA auth (#16936)

* refresh azure account token if it's expired before sending query/list requests

* fix several connection checks && add more logging

* fix async UI glitch during token refreshing

* cleanup

* minor fix

* add test for refreshAzureAccountTokenIfNecessary

* address comments

* comments

* comments

* comments

* error handling

src/sql/platform/connection/test/common/testConnectionManagementService.ts

@@ -309,4 +309,8 @@ export class TestConnectionManagementService implements IConnectionManagementSer
 	getConnection(uri: string): ConnectionProfile {
 		return undefined!;
 	}
+
+	refreshAzureAccountTokenIfNecessary(uri: string): Promise<boolean> {
+		return undefined;
+	}
 }