MC-15146: Unify DataStore get and update interface

- Fix buttons action group

Author: davemacaulay

app/code/Magento/PageBuilder/Test/Mftf/ActionGroup/ContentTypeButtonActionGroup.xml

@@ -33,7 +33,7 @@
         <comment userInput="inlineEditButton" stepKey="comment"/>
         <waitForElementVisible selector="{{ButtonItemOnStage.base(index)}}" stepKey="waitForButton"/>
         <waitForElementVisible selector="{{ButtonItemOnStage.editableButtonItemElement(index)}}" stepKey="waitForButtonEditable"/>
-        <fillField selector="{{ButtonItemOnStage.editableButtonItemElement(index)}}" userInput="{{text.value}}" stepKey="enterButtonText"/>
+        <pressKey selector="{{ButtonItemOnStage.editableButtonItemElement(index)}}" userInput="{{text.value}}" stepKey="enterButtonText"/>
         <waitForPageLoad stepKey="waitForPageLoad"/>
         <seeElement selector="{{ButtonItemOnStage.buttonItemText(index, text.value)}}" stepKey="seeButtonText"/>
         <click selector="{{pageBuilderArea}}{{PageBuilderPanel.searchPanel}}" stepKey="unFocusLiveEdit"/>