[SQL Migration][Hotfix] Remove parameter from IR validation (#21800)

* Remove encryptConnection from validateIR

* Use correct version

* vbump to 1.2.6 for insiders release

extensions/sql-migration/src/models/stateMachine.ts

@@ -1141,6 +1141,7 @@ export class MigrationStateModel implements Model, vscode.Disposable {
 					authentication: this._authenticationType,
 					userName: this._sqlServerUsername,
 					password: this._sqlServerPassword,
+					// to-do: use correct value of encryptConnection and trustServerCertificate
 					trustServerCertificate: currentConnection?.options.trustServerCertificate ?? false
 				},
 				scope: this._targetServerInstance.id,