Update to react version 18

• Updated several packages
• Breaking change to @testing-library/user-event required large number of test file changes adding async to each call
• react-mui-dropzone replaced with forked version mui-file-dropzone due to the former being a dead project and not supporting newer versions of mui/react
• clsx and @mui/styles removed as they are no longer needed/supported
• Updated linting packages contained new rules, most of which have been temporarily turned off. These should be reviewed and turned on one-by-one.
• Prettier formatting rules were updated, many changes are due to this autoformatting. Recommend revieiwing each commit individually, starting with ca6876c6
• One test was providing difficulties, as such it is skipped for now