[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/integration/channels/enterprise/bot_accounts/managing_bot_accounts_spec.ts

@@ -28,8 +28,8 @@ describe('Managing bot accounts', () => {
         cy.apiLogout();
         cy.visit('/login');
 
-        // # Remove autofocus from login input
-        cy.get('.login-body-card-content').should('be.visible').focus();
+        // # Click on card titile to remove auto focus from the email field
+        cy.get('.login-body-card-title').click();
 
         // # Enter bot name in the email field
         cy.findByPlaceholderText('Email, Username or AD/LDAP Username', {timeout: TIMEOUTS.ONE_MIN}).clear().type(botName);