Adding database backup and accounts page to migration wizard (#13764)

* Added localized strings
Created a db backup page
added radio buttons

* created components for database backup page

* Added account selection page

* Added accounts page

* Some more work done

- Added page validations
- Almost done with db backup except for a few api calls.

* Some more progress
added graph api for storage account

* Finished hooking up all the endpoints on db page.

* Some code fixed and refactoring

* Fixed a ton of validation bugs

* Added common localized strings to the constants file

* some code cleanup

* changed method name to makeHttpGetRequest

* change http result class name

* Added return types and return values to the functions

* removed void returns

* Added more return types and values

* Storing accounts in the map with ids as key
Fixed a bug in case of no subscriptions found

* cleaning up the code

* Fixed localized strings

* Added comments to get request api
Added validation logic to database backup page
removed unnecessary page validations.

* Added some get resource functions in azure core

* Changed thenable to promise

* Added arm calls for file shares and blob storage

* Added field specific validation error message

* Added examples in validation error message.

* Fixed some typings and localized string

* Added live validations to dropdowns

* Fixed method name to getSQLVMservers

* Using older storage package

* Update typings/namings (#13767)

* Update typings

* more typings fixes

* switched fileshares and blobcontainers api to http requests

* removed the extra line

* Adding resource graph documentation link as a comment

* remove makeHttpRequest api from azurecore

Co-authored-by: Charles Gagnon <chgagnon@microsoft.com>

extensions/azurecore/src/localizedConstants.ts

@@ -74,3 +74,10 @@ export const azureArcPostgresServer = localize('azurecore.azureArcPostgres', "Az
 
 export const unableToOpenAzureLink = localize('azure.unableToOpenAzureLink', "Unable to open link, missing required values");
 export const azureResourcesGridTitle = localize('azure.azureResourcesGridTitle', "Azure Resources (Preview)");
+
+// Azure Request Errors
+export const invalidAzureAccount = localize('azurecore.invalidAzureAccount', "Invalid account");
+export const invalidTenant = localize('azurecore.invalidTenant', "Invalid tenant for subscription");
+export function unableToFetchTokenError(tenant: string): string {
+	return localize('azurecore.unableToFetchToken', "Unable to get token for tenant {0}", tenant);
+}