Add total projects imported usage ping

changelogs/unreleased/georgekoltsov-add-usage-ping-total-projects-imported.yml

+---
+title: Add total projects imported usage ping
+merge_request: 46541
+author:
+type: added

lib/gitlab/usage_data.rb

@@ -589,6 +589,7 @@ module Gitlab
             gitlab: distinct_count(::BulkImport.where(time_period, source_type: :gitlab), :user_id)
           },
           projects_imported: {
+            total: count(Project.where(time_period).where.not(import_type: nil)),
             gitlab_project: projects_imported_count('gitlab_project', time_period),
             gitlab: projects_imported_count('gitlab', time_period),
             github: projects_imported_count('github', time_period),

spec/lib/gitlab/usage_data_spec.rb

@@ -221,6 +221,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
             gitlab: 2
           },
           projects_imported: {
+            total: 20,
             gitlab_project: 2,
             gitlab: 2,
             github: 2,
@@ -244,6 +245,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
             gitlab: 1
           },
           projects_imported: {
+            total: 10,
             gitlab_project: 1,
             gitlab: 1,
             github: 1,