* Refactor java feature tests grep syntax
The grep with pipe syntax was creating problems with the check helper
Change them in favour of process substitution syntax
* Fix java feature tests about java version
Java 18 is not available anymore in SDKMAN
Some tests asserts were generating false positives
* Add Gradle and Maven version parameters to Java
* test updates to adopt https://github.com/devcontainers/cli/pull/124
* remove accidental tgz check in
* typo in option
* typo in python install script on dotnet6/jammy branch
* no scenarios
* code review and test name
* Delete install_os_provided_python.sh
