Multi-release project doesn't wire references into an MR-jar correctly

When an MR-project references an MR-jar in its dependencies, I expect that files in the project's src17 folder can see classfiles within the MR-jar file's META-INF/versions/17 tree.

This is the case for the builder but not for the reconciler.

Compare how the builder and reconciler handle an MR-project dependency on an MR-jar. Start with the reference handling for files under src17 and classfiles under META-INF/versions/17. Done means the reconciler exposes the MR-jar's versioned classfiles to the project's src17 sources, matching the builder.

Written by the indexing model from the issue text.