Refactor/migrate/autocomplete database speabase specs to ts (#27837)

* refactor: migrate database/users_spec.js to ts

- migrate file autocomplete/database/users_spec.js to typescripts
- udpate system.d.ts data type adding type
for shouldHaveElasticsearchDisabled

* refactor: migrate users_in_channel_switcher_spec.js

- migrate file users_in_channel_switcher_spec to typescript
- fix issue with data type on file autocomplete/helpers.ts
function verifySuggestionAtChannelSwitcher
- fix issue with data type on file autocomplete/common_test.ts
function doTestQuickChannelSwitcher

* refactor: migrate users_in_message_input_box_spec to ts

- migrate file database/users_in_message_input_box_spec.js to typescript
- migrate file support/ui/suggestion_list.js to typescript and update
docs and type definitions
- update references to doTestPostextbox function
- update references to verifySuggestionAtPostTextbox function

---------

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

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

@@ -16,13 +16,13 @@ import {
     verifySuggestionAtPostTextbox,
 } from './helpers';
 
-export function doTestPostextbox(mention: string, ...suggestion: Cypress.UserProfile[]) {
+export function doTestPostextbox(mention: string, ...suggestion: SimpleUser[]) {
     getPostTextboxInput();
     startAtMention(mention);
     verifySuggestionAtPostTextbox(...suggestion);
 }
 
-export function doTestQuickChannelSwitcher(mention: string, ...suggestion: Cypress.UserProfile[]) {
+export function doTestQuickChannelSwitcher(mention: string, ...suggestion: SimpleUser[]) {
     getQuickChannelSwitcherInput();
     startAtMention(mention);
     verifySuggestionAtChannelSwitcher(...suggestion);
@@ -49,10 +49,10 @@ export function doTestUserChannelSection(prefix: string, testTeam: Cypress.Team,
         type(`@${prefix}odinson`);
 
     // * Thor should be a channel member
-    cy.uiVerifyAtMentionInSuggestionList(thor as Cypress.UserProfile, true);
+    cy.uiVerifyAtMentionInSuggestionList(thor, true);
 
     // * Loki should NOT be a channel member
-    cy.uiVerifyAtMentionInSuggestionList(loki as Cypress.UserProfile, false);
+    cy.uiVerifyAtMentionInSuggestionList(loki, false);
 }
 
 export function doTestDMChannelSidebar(testUsers: Record<string, SimpleUser>) {