Deprecate react-test-utils P-1

[vmnavarro94]

Remove use of 'shallow' (react-unit-test-utils) in following components/files:

• src/components/ConfirmModal.test.jsx
• src/components/DemoAlert/index.test.jsx
• src/components/FilePopoverContent/index.test.jsx
• src/components/FilePreview/FileCard.test.jsx
• src/components/StatusBadge.test.jsx