Fix running/testing Gradle projects on contemporary versions of Java

[amotl]

About

There is still a need for adjusting how Gradle projects will optimally be invoked. After adjusting the Gradle project incantation procedure recently, cratedb-examples was observing a regression on its Gradle project(s).

• Always invoke gradle wrapper, or not. pyveci/pueblo#37

The new heuristics in ngr will wipe an existing Gradle wrapper and generate a new one, when the gradle program is installed on the machine. This accomodates running on contemporary versions of Java, which will otherwise fail like Unsupported class file major version 65.

• ngr: Fix Gradle test runner by wiping existing gradlew Gradle wrapper pyveci/pueblo#38

References

• This currently blocks/obstructs Npgsql: Fix test matrix, and add .NET 8.0 #178.

[amotl]

It was just for testing, and it works well.