[Vis builder] get correct element (#869)

Finds the correct element when loading instead of a regular
visualization loader.

Error easier to catch since wait for loader is less flakey.

Issue:
opensearch-project/OpenSearch-Dashboards#5043

Signed-off-by: Kawika Avilla <[email protected]>
(cherry picked from commit 56a74e8)

cypress/integration/core-opensearch-dashboards/opensearch-dashboards/apps/vis_builder/dashboard.spec.js

@@ -138,7 +138,7 @@ if (Cypress.env('VISBUILDER_ENABLED')) {
         // Save and return
         cy.getElementByTestId('visBuilderSaveAndReturnButton').click();
 
-        cy.getElementByTestId('visualizationLoader').should(
+        cy.getElementByTestId('visBuilderLoader').should(
           'contain.text',
           newLabel
         );