Deleting a cloned translation causes an error to be thrown in when content moderation is enabled.

steps to reproduce
0. Enable content moderation and enable editorial workflow for all content types.
1. Enabled translation.
2. Add a language in addition to default language.
3. create a node in default language
4. Add a translation in another language
5. Clone the translation created in step 4.
6. Attempt to delete the translation created in Step 5.

expected result: Translation is deleted:

Actual result: Error is thrown:

The specified translation (de) cannot be removed. in <em class="placeholder">Drupal\Core\Entity\Sql\SqlContentEntityStorage-&gt;save()</em> (line <em class="placeholder">829</em> of <em class="placeholder">core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php</em>).

This is happening because when cloning a translation, a content moderation state is created for it. And the content moderation state entity is marked as the default language even though we are cloning a translation. See screen shot of db entries. Then when one tries to delete the translation, it triggers content_moderation delete hooks, which tries to delete the associated moderation state. Content moderation calls:
removeTranslation method in ContentEntityBase.php:

public function removeTranslation($langcode) {
    if (isset($this->translations[$langcode]) && $langcode != LanguageInterface::LANGCODE_DEFAULT && $langcode != $this->defaultLangcode) {
.....
.....
 else {
      throw new \InvalidArgumentException("The specified translation ($langcode) cannot be removed.");
    } 

The condition fails and we end up with the exception.

Suggested approach

Maybe entity clone should just check if the cloned entity is a translation and always clone the source (default translation).