[MM-62986][MM-63011][MM-63013][MM-63014][MM-63018] Various accessibility fixes around login, account creation and MFA setup (#30847)

* [MM-62986] Ensure focus goes back to the inputs after an error for Login/Create Account/MFA

* [MM-63011] Show outline on Mattermost logo link when focused

* [MM-63018] Remove tabindex from the login/signup cards and use <form> element for submit

* [MM-63014] Toggle aria-label when show/hide password is pressed

* [MM-63013] Mention the field name when showing an error message about the password field

* Fix lint

* Update screenshots and fix tests

* Update screenshots and fix tests

* Fix tests

* Update webapp/channels/src/components/mfa/setup/setup.tsx

Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>

* update screenshots

---------

Co-authored-by: yasserfaraazkhan <attitude3cena.yf@gmail.com>
Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>

e2e-tests/cypress/tests/support/common_login_commands.js

@@ -5,7 +5,7 @@ import * as TIMEOUTS from '../fixtures/timeouts';
 
 Cypress.Commands.add('checkLoginPage', (settings = {}) => {
     // # Remove autofocus from login input
-    cy.get('.login-body-card-content').should('be.visible').focus();
+    cy.get('.login-body-card-title').click();
 
     // * Check elements in the body
     cy.get('#input_loginId', {timeout: TIMEOUTS.ONE_MIN}).should('be.visible').and(($loginTextbox) => {