[MM-63035][MM-63970][MM-63978][MM-64028][MM-64019][MM-64022][MM-64026][MM-64023][MM-61625] Create User Group modal accessibility fixes (#31047)

* [MM-63970] Add aria-live for creating a group, always use modal animation

* [MM-63978] Move my fix for multiselect remove button focus to the multiselect component

* [MM-63035][MM-64028] Change legend to label, fieldset to div in the Input component

* [MM-64019] Add fieldset and legend to Add people

* [MM-64026] Add required to Name and Mention boxes

* [MM-64023] Add results available aria-live area to multiselect

* [MM-64022] Restore original multivalueremove for users_email_input, use ariaLabelRenderer for Multiselect

* Use noteText for required for now

* Fix

* Fix e2e

* Only show required prompt when there are no users picked

* Fix cancel button submitting form

* PR feedback

* Do the required field for multiselect properly

* Other PR feedback

* Fix checks

---------

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

e2e-tests/cypress/tests/integration/channels/enterprise/accessibility/accessibility_modals_dialogs_spec.ts

@@ -71,7 +71,7 @@ describe('Verify Accessibility Support in Modals & Dialogs', () => {
             });
 
             // * Verify if the reader is able to read out the selected row
-            cy.get('.filtered-user-list .sr-only').
+            cy.get('.filtered-user-list div.sr-only:not([role="status"])').
                 should('have.attr', 'aria-live', 'polite').
                 and('have.attr', 'aria-atomic', 'true').
                 invoke('text').then((text) => {
@@ -181,7 +181,7 @@ describe('Verify Accessibility Support in Modals & Dialogs', () => {
                 });
 
             // * Verify if the reader is able to read out the selected row
-            cy.get('.filtered-user-list .sr-only').
+            cy.get('.filtered-user-list div.sr-only:not([role="status"])').
                 should('have.attr', 'aria-live', 'polite').
                 and('have.attr', 'aria-atomic', 'true').
                 invoke('text').then((text) => {