[MM-61570]: Refactored the post priority menu and fixed the keyboard navigation issue in the menu. (#29583)

* [MA-7]: Refactored the post priority menu and fixed the keyboard navigation issue in the menu

* [MA-7]: Updated the menu list structure and fixed menu not closing bug

* [MA-7]: Review fixes minor code structure fixes

* [MA-7]: Fixed failing e2e test cases

* [MA-7]: Fixed styling and Keyboard behaviour of menu

* [MA-7]: Minor changes after rebased with master

* [MA-7]: Fixed failing playwright test case

* [MA-7]: Fixed failing e2e test cases

* [MA-7]: Fixed reverting of selected priority to previous value on menu close

* [MA-7]: Fixed failing smoke test

* [MA-7]: Fixed submenu pointer event and failing playwright test cases

* [MA-7]: Fixed failing playwright test case

* fix playwright tests

* fix playwright tests

---------

Co-authored-by: yasserfaraazkhan <attitude3cena.yf@gmail.com>

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

@@ -74,7 +74,7 @@ describe('Post Header', () => {
             // * Check that the center dot menu button and dropdown are visible
             cy.get(`#post_${postId}`).should('be.visible');
             cy.get(`#CENTER_button_${postId}`).should('be.visible');
-            cy.get(`#CENTER_dropdown_${postId}`).should('be.visible').type('{esc}');
+            cy.get('body').type('{esc}');
 
             // # Click to other location like post textbox
             cy.uiGetPostTextBox().click();