[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/version.py

@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-# lint: pylint
 # pylint: disable=,missing-module-docstring,missing-class-docstring
 
 import os
@@ -108,6 +107,7 @@ if __name__ == "__main__":
     if len(sys.argv) >= 2 and sys.argv[1] == "freeze":
         # freeze the version (to create an archive outside a git repository)
         python_code = f"""# SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
 # this file is generated automatically by searx/version.py
 
 VERSION_STRING = "{VERSION_STRING}"