Mm 62677 - modal focus management - find channels modal (#29957)

* MM-62312 - modal focus management; revamp quick switch channel modal!

* get quick switch test working

* configure the generic modal to accept refs to focus within and onhide to the origin element

* apply pr feedback, get modal element get autofocus, use id instead of ref

* update more direct channels modal to use generic modal

* fix unit tests and snapshots

* fix unit tests

* fix modal margin top to fit in smaller screens

* fix e2e test

* remove unnecesary onexited extra call

* fix e2e tests

* set correct label

* fix snapshots

* create helper function for sending custom focus event

* migrate quick switch modal to use new approach to focus

* migrate more direct channels modal to new approach

* fix snapshots

* fix types

* fix modal closing behavior

* fix snapshots

* fix cypress tests

* remove only

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

e2e-tests/cypress/tests/integration/channels/archived_channel/archive_channel_header_spec.ts

@@ -64,7 +64,7 @@ describe('Archive channel header spec', () => {
         cy.get('#channelArchiveChannel').should('be.visible');
 
         // * Add members menu option should be visible;
-        cy.get('#channelAddMembers').should('be.visible');
+        cy.get('#channelInviteMembers').should('be.visible');
 
         // * Notification preferences option should be visible;
         cy.get('#channelNotificationPreferences').should('be.visible');
@@ -91,7 +91,7 @@ describe('Archive channel header spec', () => {
         cy.get('#channelArchiveChannel').should('not.exist');
 
         // * Add members menu option should not be visible;
-        cy.get('#channelAddMembers').should('not.exist');
+        cy.get('#channelInviteMembers').should('not.exist');
 
         // * Notification preferences option should not be visible;
         cy.get('#channelNotificationPreferences').should('not.exist');