Move default_path to legacy_default_path. Switch to the new path for live-trace

lib/gitlab/ci/trace.rb

@@ -92,7 +92,7 @@ module Gitlab
       end
 
       def erase!
-        trace_artifact&.destroy
+        job.job_artifacts_trace&.destory
 
         paths.each do |trace_path|
           FileUtils.rm(trace_path, force: true)
@@ -101,12 +101,6 @@ module Gitlab
         job.erase_old_trace!
       end
 
-      def current_path
-        @current_path ||= paths.find do |trace_path|
-          File.exist?(trace_path)
-        end
-      end
-
       private
 
       def ensure_path
@@ -122,6 +116,12 @@ module Gitlab
         end
       end
 
+      def current_path
+        @current_path ||= paths.find do |trace_path|
+          File.exist?(trace_path)
+        end
+      end
+
       ##
       # This method doesn't include the latest path, which is JobArtifactUploader#default_path,
       # Because, in EE, traces can be moved to ObjectStorage, so checking paths in Filestorage doesn't make sense.