Renaming controller to migration service and other bug fixes/ validations. (#14751)

* - Added coming soon message for learn more.
- Potential fix for learn more message

* Renaming of controller to sqlMigrationService

* Surfacing some errors
-Azure account is stale error
-Migration Service creation error.

* Adding refresh azure token validation.

* Fixing some errors pointed during PR
-Fixing property names
-Fixing count

* Fixing migration status
- Adding special error handling for resource not found error
- Deleting unfound migrations from local cache
- Using prefetched migration status for view all

Misc fixes:
- Using SQL server version name instead of number
- Fixing Icons on sku recommendation page
- Fixing table column width in cutover dialog
- Adding spinner button to refresh.

* Fixing all strings in migration service page and dialog

* fixed a string error in create service dialog

extensions/sql-migration/src/wizard/summaryPage.ts

@@ -46,7 +46,7 @@ export class SummaryPage extends MigrationWizardPage {
 				createHeadingTextComponent(this._view, constants.DATABASE_BACKUP_PAGE_TITLE),
 				this.createNetworkContainerRows(),
 				createHeadingTextComponent(this._view, constants.IR_PAGE_TITLE),
-				createInformationRow(this._view, constants.IR_PAGE_TITLE, this.migrationStateModel._migrationController?.name!),
+				createInformationRow(this._view, constants.IR_PAGE_TITLE, this.migrationStateModel._sqlMigrationService?.name!),
 				createInformationRow(this._view, constants.SUMMARY_IR_NODE, this.migrationStateModel._nodeNames.join(', ')),
 
 			]