Upgrade Jest to 29.7.0 in che-remote and remove from che-activity-tracker (che-incubator#610)

* Upgrade Jest to 29.7.0 in che-remote and remove from che-activity-tracker

che-remote:
- Upgraded Jest from 27.3.1 to 29.7.0
- Updated @types/jest from ^27.4.0 to ^29.5.0
- Updated ts-jest from 27.0.7 to 29.4.5
- All tests pass successfully

che-activity-tracker:
- Removed Jest dependencies (jest, @types/jest, ts-jest)
- Removed test script (no tests exist in this extension)
- Removed jsdom overrides (no longer needed without Jest)
- Reduced package count from 283 to 6 packages

This brings che-remote in line with other che extensions using Jest 29.7.0, while removing unnecessary testing infrastructure from che-activity-tracker.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* added typescript as dev dependency, similar to launcher code

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Co-authored-by: Claude <noreply@anthropic.com>

Author: sbouchet