[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>
191818b865