remove gl_project_id for I/E version update

app/models/commit_status.rb

@@ -142,12 +142,6 @@ class CommitStatus < ActiveRecord::Base
     canceled? && auto_canceled_by_id?
   end
 
-  # Added in 9.0 to keep backward compatibility for projects exported in 8.17
-  # and prior.
-  def gl_project_id
-    'dummy'
-  end
-
   def detailed_status(current_user)
     Gitlab::Ci::Status::Factory
       .new(self, current_user)

lib/gitlab/import_export/import_export.yml

@@ -87,7 +87,6 @@ methods:
     - :type
   statuses:
     - :type
-    - :gl_project_id
   services:
     - :type
   merge_request_diff: