Fixing bugs related to nested blocks inside roles

* Make sure dep chains are checked recursively for nested blocks
* Fixing iterator is_failed() check to make sure we're not in a
  rescue block before returning True
* Use is_failed() to test whether a host should be added to the TQM
  failed_hosts list
* Use is_failed() when compiling the list of hosts left to iterate
  over in both the linear and free strategies

Fixes #14222

lib/ansible/playbook/block.py

@@ -153,8 +153,6 @@ class Block(Base, Become, Conditional, Taggable):
         if self._dep_chain is None:
             if self._parent_block:
                 return self._parent_block.get_dep_chain()
-            elif self._task_include:
-                return self._task_include._block.get_dep_chain()
             else:
                 return None
         else: