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/helpers.ts

@@ -210,14 +210,14 @@ function startAtMention(string: string) {
     cy.get('#suggestionList').should('be.visible');
 }
 
-function verifySuggestionAtPostTextbox(...expectedUsers: Cypress.UserProfile[]) {
+function verifySuggestionAtPostTextbox(...expectedUsers: SimpleUser[]) {
     expectedUsers.forEach((user) => {
         cy.wait(TIMEOUTS.HALF_SEC);
         cy.uiVerifyAtMentionSuggestion(user);
     });
 }
 
-function verifySuggestionAtChannelSwitcher(...expectedUsers: Cypress.UserProfile[]) {
+function verifySuggestionAtChannelSwitcher(...expectedUsers: SimpleUser[]) {
     expectedUsers.forEach((user) => {
         cy.findByTestId(user.username).
             should('be.visible').