Modified and implemented new backend services required for Contributo…

…r Admin Dashboard: GSoC M1.5 (oppia#18560)

* failing tests

* restored changed file

* added new services required for contributor admin dashboard

* added services for translation updates

* added services to update question stats

* added tests for sevices in suggestion services

* covered backend test coverage

* fixed lint errors

* fixed lint errors

* fixed lint errors

* fixed mypy errors

* fixed mypy errors

* added test to backend shrads file

* Update core/domain/contributor_admin_dashboard_services_test.py

Co-authored-by: Jay Vivarekar <[email protected]>

* Update core/domain/contributor_admin_dashboard_services.py

Co-authored-by: Jay Vivarekar <[email protected]>

* changes requested by chris

* removed reduntant variable

* Update core/domain/contributor_admin_dashboard_services.py

Co-authored-by: Aasif Faizal <[email protected]>

* Update core/domain/contributor_admin_dashboard_services.py

Co-authored-by: Aasif Faizal <[email protected]>

* Update core/domain/contributor_admin_dashboard_services.py

Co-authored-by: Aasif Faizal <[email protected]>

* Update core/domain/suggestion_services.py

Co-authored-by: Aasif Faizal <[email protected]>

* made 99 as constant

* changed name of fie

* changed name in codeowner file

* added test to backend shards

* added comments for assertion

* moved code to a different function

* fixed pylint errors

* added docstring for the function

* fixed pylint errors

* fixed pylint errors

* changed implementaion method for mypy checks

* changed implementaion method for mypy checks

---------

Co-authored-by: Jay Vivarekar <[email protected]>
Co-authored-by: Aasif Faizal <[email protected]>

.github/CODEOWNERS

@@ -606,6 +606,7 @@
 /core/templates/domain/suggestion/ @oppia/contributor-experience-team
 /core/templates/services/suggestion-modal.service*.ts @oppia/contributor-experience-team
 /core/templates/services/suggestions.service*.ts @oppia/contributor-experience-team
+/core/domain/contribution_stats_services*.py @oppia/contributor-experience-team
 
 
 # Feedback project.