Revert "Add data migration for productivity analytics"

This reverts commit 3110845a.

ee/lib/gitlab/background_migration/recalculate_productivity_analytics.rb

-# frozen_string_literal: true
-
-module Gitlab
-  module BackgroundMigration
-    class RecalculateProductivityAnalytics
-      def perform(_start_id, _end_id)
-        # Do nothing. Migration is removed.
-        # By keeping the class for a while we allow workers to work off for those environments
-        # which have scheduled the migration.
-        # Will be removed completely in https://gitlab.com/gitlab-org/gitlab/merge_requests/17957
-      end
-    end
-  end
-end

ee/spec/support/migration_helpers/recalculate_productivity_analytics_helpers.rb

-# frozen_string_literal: true
-
-module MigrationHelpers
-  module RecalculateProductivityAnalyticsHelpers
-    def create_populated_mr(user, project, attributes: {}, metrics: {})
-      base = {
-        author_id: user.id,
-        source_project_id: project.id,
-        target_project_id: project.id,
-        source_branch: 'master',
-        target_branch: 'feature'
-      }
-
-      mr = table(:merge_requests).create!(base.merge(attributes))
-      table(:merge_request_metrics).create!(metrics.merge(merge_request_id: mr.id))
-
-      create_mr_activity(mr)
-      create_notes(mr)
-
-      mr
-    end
-
-    def create_notes(mr)
-      # 4 notes per MR
-      table(:notes).create!(note: 'sample note', noteable_type: 'MergeRequest', noteable_id: mr.id, author_id: user.id, created_at: 4.weeks.ago + 1.day)
-      table(:notes).create!(note: 'sample note 2', noteable_type: 'MergeRequest', noteable_id: mr.id, author_id: user.id, created_at: 4.weeks.ago + 2.days)
-      table(:notes).create!(note: 'system note', noteable_type: 'MergeRequest', noteable_id: mr.id, created_at: 4.weeks.ago + 3.days)
-      table(:notes).create!(note: 'bot note', noteable_type: 'MergeRequest', noteable_id: mr.id, author_id: bot.id, created_at: 4.weeks.ago + 2.days)
-    end
-
-    def create_mr_activity(mr)
-      diff = table(:merge_request_diffs).create!(merge_request_id: mr.id, commits_count: 2)
-
-      # 2 commits per MR
-      table(:merge_request_diff_commits).create!(sha: '456', merge_request_diff_id: diff.id, authored_date: 2.weeks.ago, committed_date: 1.week.ago, relative_order: 0)
-      table(:merge_request_diff_commits).create!(sha: '123', merge_request_diff_id: diff.id, authored_date: 4.weeks.ago, committed_date: 3.weeks.ago, relative_order: 1)
-
-      # 2 diff files per MR
-      base_diff_files_attributes = {
-        merge_request_diff_id: diff.id,
-        new_file: true,
-        renamed_file: false,
-        deleted_file: false,
-        too_large: false,
-        a_mode: '0',
-        b_mode: '160000',
-        diff: "@@ -1,6 +1,6 @@\n class Commit\n   constructor: ->\n     $('.files .diff-file').each ->\n-      new CommitFile(this)\n+      new CommitFile(@)\n \n-@Commit = Commit\n+@Commit = Commit\n\\ No newline at end of file\n",
-        binary: false
-      }
-
-      table(:merge_request_diff_files).create!(
-        base_diff_files_attributes.merge(relative_order: 1, new_path: 'test_file', old_path: 'test_file')
-      )
-      table(:merge_request_diff_files).create!(
-        base_diff_files_attributes.merge(relative_order: 2, new_path: 'test_file_2', old_path: 'test_file_2')
-      )
-    end
-  end
-end