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

extensions/azurecore/src/account-provider/auths/azureAuth.ts

@@ -184,17 +184,20 @@ export abstract class AzureAuth implements vscode.Disposable {
 			const currentTime = new Date().getTime() / 1000;
 
 			let accessToken = cachedTokens.accessToken;
+			let expiresOn = Number(cachedTokens.expiresOn);
 			const remainingTime = expiry - currentTime;
 			const maxTolerance = 2 * 60; // two minutes
 
 			if (remainingTime < maxTolerance) {
 				const result = await this.refreshToken(tenant, resource, cachedTokens.refreshToken);
 				accessToken = result.accessToken;
+				expiresOn = Number(result.expiresOn);
 			}
 			// Let's just return here.
 			if (accessToken) {
 				return {
 					...accessToken,
+					expiresOn: expiresOn,
 					tokenType: 'Bearer'
 				};
 			}
@@ -214,6 +217,7 @@ export abstract class AzureAuth implements vscode.Disposable {
 		if (result.accessToken) {
 			return {
 				...result.accessToken,
+				expiresOn: Number(result.expiresOn),
 				tokenType: 'Bearer'
 			};
 		}
@@ -674,6 +678,11 @@ export interface Token extends AccountKey {
 	 */
 	token: string;
 
+	/**
+	 * Access token expiry timestamp
+	 */
+	expiresOn?: number;
+
 	/**
 	 * TokenType
 	 */