[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/limiter.py

@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-# lint: pylint
 """Bot protection / IP rate limitation.  The intention of rate limitation is to
 limit suspicious requests from an IP.  The motivation behind this is the fact
 that SearXNG passes through requests from bots and is thus classified as a bot