[MM-55285]: Screen reader speaking wrong item in list in Find Channels modal (#29552)

* [MA-11]: Fix Screen reader speaking wrong item in list in Find Channels modal

* [MA-11]: Update types across files

* [MA-11]: Minor refactoring

* [MA-11]: Fix e2e test

* [MA-11]: Fix E2E tests

* [MA-11]: Update role and id

* [MA-11]: Fix playwright tests

---------

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

e2e-tests/cypress/tests/integration/channels/autocomplete/helpers.ts

@@ -119,7 +119,7 @@ function getPostTextboxInput() {
 }
 
 function getQuickChannelSwitcherInput() {
-    cy.findByRole('textbox', {name: 'quick switch input'}).
+    cy.findByRole('combobox', {name: 'quick switch input'}).
         should('be.visible').
         as('input').
         clear();
@@ -158,7 +158,7 @@ function searchForChannel(name: string) {
     cy.typeCmdOrCtrl().type('k').wait(TIMEOUTS.ONE_SEC);
 
     // # Clear out and type in the name
-    cy.findByRole('textbox', {name: 'quick switch input'}).
+    cy.findByRole('combobox', {name: 'quick switch input'}).
         should('be.visible').
         as('input').
         clear().