Clean up language and resource providers in query

pkg/engine/query.go

@@ -75,6 +75,7 @@ func Query(ctx *Context, q QueryInfo, opts UpdateOptions) result.Result {
 	if err != nil {
 		return result.FromError(err)
 	}
+	defer plugctx.Close()
 
 	return query(ctx, q, QueryOptions{
 		Events:      emitter,

pkg/resource/deploy/source_query.go

@@ -105,7 +105,6 @@ type querySource struct {
 func (src *querySource) Close() error {
 	// Cancel the monitor and reclaim any associated resources.
 	src.done = true
-	close(src.langPluginFinChan)
 	return src.mon.Cancel()
 }