title: Rails 6 Remove specific error - delete(:email)
body: <p>I know I can use <code>user.errors.delete(: email)</code> to delete the email validation error, but if an email has multiple errors on it, I assume it would remove all the errors associated with email.</p>
  <p>Do rails have a way to delete a specific error message? I would like to remove the <code>:already_confirmed</code> error only.  Looking for something like:  <code>user.errors.delete( email: :already_confirmed)</code></p>
  <pre><code>=&gt; #&lt;ActiveModel::Errors:0x007feee7ab60ere8
   @base=
    #&lt;User id: 123, email: &quot;some@domain.com&quot;, created_at: &quot;2020-09-26 19:00:38&quot;, updated_at: &quot;2020-09-26 19:01:27&quot;, first_name: nil, last_name: nil&gt;,
   @details={:email=&gt;[{:error=&gt;:already_confirmed}]},
   @messages={:email=&gt;[&quot;was already confirmed, please try signing in&quot;]}&gt;
  </code></pre>