0.2.1 release

New features:

- tests: kselftest: breakpoints: enable x86_64
- tests: enable rt-tests
- test: unit: test_device
- templates: tests: kselftest: skip_install 'True'
- tests: mmtests: add unixbench test
- jobs: test-definitions: update to tag 2025.03
- rt-tests: add a ITERATIONS variable