Precompiled Jte tests use generated output from test sources

[dzikoysk]

The whole precompiled directory shouldn't be a part of test sources, e.g.:

https://github.com/javalin/javalin-rendering/blob/main/src/test/java/io/javalin/jte/precompiled/JtetestGenerated.java

These classes should be generated by Maven plugin:

https://github.com/casid/jte/blob/main/DOCUMENTATION.md#maven

[tipsy]

@casid thoughts on this? Could you update the integration to JTE3?

[casid]

I think we included the classes to speed up test execution. Generating them by the maven plugin would indeed be nicer (and probably unnoticed in build time).

@tipsy I haven't created a PR yet, since Javalin Rendering still supports Java 11 and jte 3 requires Java 17 as baseline.

[tipsy]

We are moving to Java 17 for 6x, and I am moving rendering to 6x as we speak :)

[tipsy]

Pushed repo to v6 now