[MM-59060] Remove pre release features section from advanced section of user settings (#27608)

e2e-tests/cypress/tests/integration/channels/messaging/markdown_preview_inline_image_spec.js

@@ -14,7 +14,6 @@ describe('Messaging', () => {
     before(() => {
         // # Login as test user and visit off-topic
         cy.apiInitSetup({loginAfter: true}).then(({offTopicUrl}) => {
-            cy.apiSaveShowMarkdownPreviewPreference();
             cy.visit(offTopicUrl);
             cy.postMessage('hello');
         });

e2e-tests/cypress/tests/integration/channels/messaging/message_spec.js

@@ -143,8 +143,6 @@ describe('Message', () => {
     });
 
     it('MM-T3307 Focus remains in the RHS text box', () => {
-        cy.apiSaveShowMarkdownPreviewPreference();
-
         cy.postMessage(MESSAGES.MEDIUM);
 
         // # Open reply thread (RHS)