MM-59065 - New channel menu using new menu system (#30093)

* New channel menu using new menu system

* fix e2e-tests

* remove extraneous separator

* lint fix

* fix test after merge

* update to pass properties to first menu item

* fix e2etest

* refactor: Update channel header menu items to use const event handlers

* refactor: Extract plugin item click handler in channel header menu

* refactor: Improve error handling and button click handlers in mobile channel header plugins

* lint fixes

* updates for code reveiw

* run i18n-extract

* fix unit test

* fix: Close channel dropdown menu by clicking channel header title

* fix: Use keyboard escape to close channel dropdown menu in e2e tests

* fix cypress test

* fix: Resolve MUI Menu component fragment rendering issue

* cleanup

* remove unneccessary css

* fixing testing issues

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Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/cypress/tests/integration/channels/system_console/user_management/users_deactivation_spec.js

@@ -72,7 +72,7 @@ describe('System Console > User Management > Deactivation', () => {
             cy.sendDirectMessageToUser(other, MESSAGES.SMALL);
 
             // # Close DM
-            cy.get('#channelHeaderDropdownIcon').click();
+            cy.get('#channelHeaderTitle').click();
             cy.findByText('Close Direct Message').click();
 
             // # Deactivate the user