Migration Private preview 1 fixes 2 (#14898)

* Removing canary host

* Rebranding extension name to Azure SQL Migration

* stopping instance table overflow in assessment dialog

* Added info message for details copied

* Limiting storage account and DMS to the same subscription as target

* making accounts page look like figma mockups

* converting error messages to warnings in cutover dialog

* making source config page look like figma mockups

* adding more filters for storage account and dms

* Adding validations for target database names.

* Fixing branding in other strings

* Adding types for SQL Managed Instance

extensions/sql-migration/src/dialog/migrationCutover/migrationCutoverDialogModel.ts

@@ -6,6 +6,12 @@
 import { getMigrationStatus, DatabaseMigration, startMigrationCutover, stopMigration } from '../../api/azure';
 import { MigrationContext } from '../../models/migrationLocalStorage';
 
+export enum MigrationStatus {
+	Failed = 'Failed',
+	Succeeded = 'Succeeded',
+	InProgress = 'InProgress',
+	Canceled = 'Canceled'
+}
 
 export class MigrationCutoverDialogModel {