MM-52487: fix more playbooks tests (#23475)

* fix playbooks/channels/rhs/template_spec.js

* fix playbooks/channels/update_request_post_spec.js

* fix playbooks/runs/rdp_rhs_runinfo_spec.js

* fix playbooks/runs/rdp_rhs_statusupdates_spec.js

* remove enableexperimentalfeatures flag in e2e tests

* rdp_main_header_spec: simplify channel loaded assertion

* playbooks rhs participants: fix infinite fetch loop

* improved onboarding skipping

* simplify participants fetching

e2e-tests/cypress/tests/support/api/user.js

@@ -260,7 +260,7 @@ Cypress.Commands.add('apiCreateUser', ({
         cy.apiSaveDraftsTourTipPreference(createdUser.id, true);
 
         if (bypassTutorial) {
-            cy.apiSaveTutorialStep(createdUser.id, '999');
+            cy.apiDisableTutorials(createdUser.id);
         }
 
         if (hideActionsMenu) {