Move jest to dev dependencies

[heathsnee]

When trying to use latest version of the package, jest being in deps produces error for end user.

 yarn add @radixdlt/application

error An unexpected error occurred: "expected workspace package to exist for \"@jest/core\"".
info If you think this is a bug, please open a bug report with the information provided in "yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.