Fix flaky Java inlay hints test

[datho7561]

See

lsp4mp/microprofile.jdt/org.eclipse.lsp4mp.jdt.test/src/main/java/org/eclipse/lsp4mp/jdt/core/config/java/MicroProfileConfigJavaInlayHintsTest.java

Line 47 in b0a407d

public void defaultValuesAndConverters() throws Exception {

Something is going wrong where only 4 inlay hints are provided, or sometimes 0 inlay hints are provided.

One lead that we have is that sometimes it appears that nothing is generated in the target folder (the target folder is in fact completely absent). lsp4mp picks up property values from the config file in the target folder, so this might be the root cause.