Forcing initializing compilejava if empty

[cdsap]

(Recreating #44410 because I messed up(Pull request that contains merge commits can not be merged))

Issue #44384 describes how the task quarkusAppPartsBuild fails in a multi-module project using gRPC with Kotlin. When initializing the project for the first time, the gRPC output has not been configured, and we are not including the compileJava source directory in the application model. This behavior has the following characteristics:

• It does not occur on the second build execution, as the output is then present.
• It occurs if the project applying the plugin does not have Java sources.

Because the Project Descriptor is instantiated during configuration time, we currently lack a reliable way to retrieve the expected outputs ahead of time. This PR mitigates this issue by creating a map of abstract collection tasks and destination directories. Then, in the Application Model task, if we detect that the source directories do not include "compileJava," we verify whether an output exists in the destination directory; if this condition is met, we add it as a source directory.

This PR also adds integration tests to simulate the original issue.

• Fixes: quarkus-grpc: Generate proto files from dependencies no longer works since Quarkus 3.16 #44384

[quarkus-bot]

Thanks for your pull request!

Your pull request does not follow our editorial rules. Could you have a look?

• title should preferably start with an uppercase character (if it makes sense!)

_{This message is automatically generated by a bot.}

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 0462367.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.