[mod] pylint all files with one profile / drop PYLINT_SEARXNG_DISABLE_OPTION

In the past, some files were tested with the standard profile, others with a
profile in which most of the messages were switched off ... some files were not
checked at all.

- ``PYLINT_SEARXNG_DISABLE_OPTION`` has been abolished
- the distinction ``# lint: pylint`` is no longer necessary
- the pylint tasks have been reduced from three to two

  1. ./searx/engines -> lint engines with additional builtins
  2. ./searx ./searxng_extra ./tests -> lint all other python files

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/plugins/oa_doi_rewrite.py

@@ -1,8 +1,11 @@
-from urllib.parse import urlparse, parse_qsl
-from flask_babel import gettext
-import re
-from searx import settings
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
 
+import re
+from urllib.parse import urlparse, parse_qsl
+
+from flask_babel import gettext
+from searx import settings
 
 regex = re.compile(r'10\.\d{4,9}/[^\s]+')
 
@@ -31,7 +34,7 @@ def get_doi_resolver(preferences):
     return doi_resolvers[selected_resolver]
 
 
-def on_result(request, search, result):
+def on_result(request, _search, result):
     if 'parsed_url' not in result:
         return True