Expand account picker support to multiple providers (#23952)

* fix dropdown behavior

* expand account picker support to multiple providers

* fix tests

* fixed unresolved promise issue

src/sql/platform/accounts/common/accountActions.ts

@@ -50,7 +50,12 @@ export class AddAccountAction extends Action {
 		// Fire the event that we've started adding accounts
 		this._addAccountStartEmitter.fire();
 		try {
-			await this._accountManagementService.addAccount(this._providerId);
+			if (!this._providerId) {
+				let providerId = await this._accountManagementService.promptProvider();
+				await this._accountManagementService.addAccount(providerId);
+			} else {
+				await this._accountManagementService.addAccount(this._providerId);
+			}
 			this._addAccountCompleteEmitter.fire();
 		} catch (err) {
 			this.logService.error(`Error while adding account: ${err}`);

src/sql/platform/accounts/common/accountPickerViewModel.ts

@@ -21,7 +21,6 @@ export class AccountPickerViewModel {
 	public selectedTenantId: string | undefined;
 
 	constructor(
-		_providerId: string,
 		@IAccountManagementService private _accountManagementService: IAccountManagementService
 	) {
 		// Create our event emitters

src/sql/platform/accounts/common/interfaces.ts

@@ -21,6 +21,7 @@ export interface IAccountManagementService {
 	getAccountProviderMetadata(): Promise<azdata.AccountProviderMetadata[]>;
 	getAccountsForProvider(providerId: string): Promise<azdata.Account[]>;
 	getAccounts(): Promise<azdata.Account[]>;
+	promptProvider(): Promise<string | undefined>;
 	/**
 	 * @deprecated
 	 */