Add Jest infrastructure for Javascript unit testing
See FR-42177
- Added Jest to project
- Added ESLint rules for Jest tests
- Fixed Lint/Format scripts in client.kernel
- Migrated QUnit tests to Jest
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Remove QUnit infrastructure
- Remove QUnit tests from CI
- Remove tests + QUnit library
- Check with legal about license for libraries declared as dependencies but not distributed
- Move user doc to proper wiki page
- Include these tests in CI