(Fix): Remove tf.json filetype from terraform (#945)

Fixes #941. Verified repro
with terraform and tofu format on `x.tf.json` files. Did a bit of
research as well to make sure our other security scanners don't scan
`.tf.json` files, and we should be fine.

Author: TylerJang27

linters/plugin.yaml

@@ -592,7 +592,6 @@ lint:
     - name: terraform
       extensions:
         - tf
-        - tf.json
       comments:
         - hash
         - slashes-inline