Migrate spec/javascripts/reports/ to Jest

Description

Let's migrate the specs in spec/javascripts/reports/ from Karma to Jest.

See the related epic for how to do this.

• spec/javascripts/reports/mock_data/no_failures_report.json !31436 (merged)
• spec/javascripts/reports/mock_data/resolved_failures.json !31436 (merged)
• spec/javascripts/reports/mock_data/mock_data.js !31436 (merged)
• spec/javascripts/reports/mock_data/new_and_fixed_failures_report.json !31436 (merged)
• spec/javascripts/reports/mock_data/new_failures_report.json !31436 (merged)
• spec/javascripts/reports/components/grouped_test_reports_app_spec.js !31436 (merged)
• spec/javascripts/reports/components/modal_open_name_spec.js !31436 (merged)
• spec/javascripts/reports/components/summary_row_spec.js !31436 (merged)
• spec/javascripts/reports/components/modal_spec.js !31436 (merged)
• spec/javascripts/reports/components/test_issue_body_spec.js !31436 (merged)
• spec/javascripts/reports/store/mutations_spec.js !31436 (merged)
• spec/javascripts/reports/store/actions_spec.js !31436 (merged)