Migrate the missed enzyme unit tests to React Testing Library.

A.C.

• All Enzyme tests are migrated to RTL
• All tests are passing in CI 

Missed tests

 1.  frontend/packages/console-app/src/components/detect-perspective/{}tests{}/DetectPerspective.spec.tsx,

 2.  frontend/packages/console-app/src/components/detect-perspective/{}tests{}/PerspectiveDetector.spec.tsx,

 3.  frontend/packages/dev-console/src/components/import/image-search/{}tests{}/ImageStream.spec.tsx,

  4. frontend/packages/dev-console/src/components/monitoring/dashboard/{}tests{}/MonitoringDashboardGraph.spec.tsx,

  5. frontend/packages/webterminal-plugin/src/components/cloud-shell/setup/{}tests{}/NamespaceSection.spec.tsx