Avoid processing files under templates

Fixes: #1753

examples/templates/playbooks/playbook.yml

@@ -0,0 +1,5 @@
+# even if is hosted under playbooks and is named playbook.yml, this file
+# is not a real playbook because it is hosted in a "templates" directory
+# and that means we will avoid processing it as a playbook. Templates use
+# either jinja2 or another templating engine, so we cannot load them.
+foo: bar

src/ansiblelint/config.py

@@ -9,6 +9,7 @@
     # Do not sort this list, order matters.
     {"jinja2": "**/*.j2"},  # jinja2 templates are not always parsable as something else
     {"jinja2": "**/*.j2.*"},
+    {"text": "**/templates/**/*.*"},  # templates are likely not validable
     {"inventory": "**/inventory/**.yml"},
     {"requirements": "**/meta/requirements.yml"},  # v1 only
     # https://docs.ansible.com/ansible/latest/dev_guide/collections_galaxy_meta.html