App Passwords: Further accessibility improvements.

- Add a label to the readonly password input.
- Handle focus loss after revoking app passwords.
- Handle focus loss after dismissing notices.
- Mark app name as `aria-required`.
- Use `aria-label` for detailed revoke button text instead of `title`.
- Use `-1` for `tabindex` instead of `0`.

Props alexstine, afercia, sabernhardt, audrasjb, joedolson, TimothyBlynJacobs.
Fixes #51580.


git-svn-id: https://develop.svn.wordpress.org/trunk@49549 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/forms.css

@@ -864,7 +864,7 @@ table.form-table td .updated p {
 	padding-bottom: 0;
 }
 
-.new-application-password-notice.notice {
+#application-passwords-section .notice {
 	margin-top: 20px;
 	margin-bottom: 0;
 }
@@ -873,6 +873,10 @@ table.form-table td .updated p {
 	width: 19em;
 }
 
+.auth-app-card.card {
+	max-width: 768px;
+}
+
 /*------------------------------------------------------------------------------
   19.0 - Tools
 ------------------------------------------------------------------------------*/