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/enterprise/permissions/team_permissions_spec.ts

@@ -168,8 +168,8 @@ describe('Team Permissions', () => {
             // * Verify dropdown opens
             cy.get('#channelHeaderDropdownMenu .Menu__content.dropdown-menu').should('be.visible');
 
-            // # Click on `Add Members`
-            cy.get('#channelAddMembers').should('be.visible').click().wait(TIMEOUTS.HALF_SEC);
+            // # Click on `Invite Members`
+            cy.get('#channelInviteMembers').should('be.visible').click().wait(TIMEOUTS.HALF_SEC);
 
             // # Search and select otherUser
             cy.get('#selectItems input').typeWithForce(otherUser.username).wait(TIMEOUTS.HALF_SEC);