Remove invoice Valid checks and valid checks link (#3145)

hypha/apply/api/v1/permissions.py

hypha/apply/api/v1/projects/serializers.py

hypha/apply/api/v1/projects/views.py

hypha/apply/api/v1/tests/test_serializers.py

hypha/apply/api/v1/tests/test_views.py

hypha/apply/api/v1/urls.py

hypha/apply/projects/forms/payment.py

hypha/apply/projects/migrations/0061_remove_checks.py

hypha/apply/projects/models/payment.py

.../application_projects/includes/required_checks_block.html

.../templates/application_projects/invoice_admin_detail.html

...ojects/templates/application_projects/invoice_detail.html

hypha/apply/projects/templatetags/invoice_tools.py

hypha/apply/projects/tests/test_forms.py

hypha/apply/projects/tests/test_models.py

...tatic_src/src/javascript/apply/invoice-required-checks.js