skip typecheck lint on problematic files

When there are "real" lint errors, the linter will flood the output with
spurious errors from the typecheck linter (which is not a real linter:
golangci/golangci-lint#2177).

typecheck errors are triggered when the Go compilation frontend fails -
it's not clear why a compilation error elsewhere triggers all the
spurious errors from AccessNodeBuilder etc. But disabling these makes it
easier to find the real comppilation error.

.golangci.yml

@@ -33,3 +33,9 @@ issues:
     - path: 'cmd/access/node_build/*' 
       linters:
         - typecheck
+    - path: 'cmd/observer/node_builder/*'
+      linters:
+        - typecheck
+    - path: 'follower/*'
+      linters:
+        - typecheck