Upgrade dependencies

[matteofigus]

Update some dependencies. See in-line comments for some details about a couple of changes I had to do in order to simplify dependency management.

PR Checklist:

• Changelog updated
• All tests pass
• Pre-commit checks pass
• If releasing a new version, have you bumped the version in the main CFN template?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[matteofigus]

Create React App v5 includes loads of warnings for node 12 so I moved all to node 14.

[matteofigus]

Create React App v5 moved internally to ESLint 8, and prettier-eslint cli is stuck to ESLint 5: prettier/prettier-eslint-cli#304

When upgrading, prettier-eslint was failing. I decided to just move to prettier cli, which has a --write functionality as well. The difference is that instead of inferring the linting config from the Create React App module, I am defining the config inside the root's package.json. But the advantage is that the dependency tree is much smaller and that allows to remove some vulnerabilities too.

When running with just prettier, the linting is 99% same. You'll notice a couple of new line changes in 5 JavaScript files, but I decided that it was ok for now.

[matteofigus]

I had an issue here when running the acceptance tests. They ran for 64 minutes, and everything running during the last 4 failed with 401 status codes because the token was expired. So I decided to move the cognito token fetch from session to module in order to reduce the probability of that happening again.