[mod] drop SearXNG's checker (#5767)

To date, there is no analysis for the checker that could be evaluated in any
meaningful way.

- https://github.com/searxng/searxng/issues/3407
- https://github.com/searxng/searxng/pull/3312

The checker would need to be completely redesigned, but even then, its
usefulness and the maintenance required for it would be disproportionate.

TBH: In its current form, it is useless and only consumes resources and
causes the engines to be blocked, because these tests (query terms) come
from *hundreds* of instances and could be interpreted as bot attacks.

Related issues: [search.checker](https://github.com/searxng/searxng/issues?q=label%3A%22search.checker%22)

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

setup.py

@@ -39,7 +39,7 @@ setup(
     ],
     project_urls={"Code": GIT_URL, "Issue tracker": get_setting('brand.issue_url')},
     entry_points={
-        'console_scripts': ['searxng-run = searx.webapp:run', 'searxng-checker = searx.search.checker.__main__:main']
+        'console_scripts': ['searxng-run = searx.webapp:run']
     },
     packages=find_packages(
         include=[
@@ -54,7 +54,6 @@ setup(
             'settings.yml',
             '*.toml',
             '*.msg',
-            'search/checker/scheduler.lua',
             'data/*.json',
             'data/*.txt',
             'data/*.ftz',