MC-5691: Implement better developer error reporting

- Refactor test to remove depdency on TinyMCE4

Author: davemacaulay

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderReadNonMasterFormatTest.xml

@@ -121,7 +121,7 @@
         </actionGroup>
         <waitForElementVisible selector="{{CmsNewPagePageActionsSection.pageTitle}}" stepKey="waitForPageBuilderDisplay" />
         <waitForElementVisible time="1" selector="{{CmsNewPagePageActionsSection.showHideEditor}}" stepKey="waitForShowHideEditor" />
-        <waitForElementVisible selector="{{TinyMCESection.TinyMCE4}}" stepKey="waitForTinyMCE4" />
+        <waitForPageLoad stepKey="waitForEditor"/>
         <click selector="{{CmsNewPagePageActionsSection.showHideEditor}}" stepKey="clickShowHideEditor"/>
         <waitForElementVisible time="1" selector="{{CmsNewPagePageActionsSection.content}}" stepKey="waitForContentField" />
         <fillField selector="{{CmsNewPagePageActionsSection.content}}" userInput="{{cmsPageNonexistentDataRole.content}}" stepKey="enterContent"/>