Revert "fix: geojson invalid query on unavailable PostGIS"

This reverts commit 0f1ca8faac.

Reverting for now as it adds one more query to the schema cache and
there's no clear way forward on how to integrate the fix with the
current schema cache queries.

See discussion on
https://github.com/PostgREST/postgrest/pull/4246#pullrequestreview-3093174224.

test/io/__snapshots__/test_cli/test_schema_cache_snapshot[dbMediaHandlers].yaml

@@ -3,6 +3,11 @@
   - - tag: BuiltinOvAggCsv
     - tag: MTTextCSV
 
+- - - tag: RelAnyElement
+    - tag: MTGeoJSON
+  - - tag: BuiltinOvAggGeoJson
+    - tag: MTGeoJSON
+
 - - - tag: RelAnyElement
     - tag: MTApplicationJSON
   - - tag: BuiltinOvAggJson