Classes in ScatteredArchive are processed only once.

[OndroMih]

They are not processed again when the parser is called for JARs (web fragments). Signed-off-by:Ondro Mihalyi

Fixes #24415.

To do:

• write a test that covers [7.0.4] ServletContextListener.contextInitialized invoked multiple times #24415 with both ScatteredArchive and with a plain WAR file. The issue [7.0.4] ServletContextListener.contextInitialized invoked multiple times #24415 doesn't happen for a plain WAR file even without this fix. A reproducer needs to bundle at least 1 JAR file in the lib directory.
  • I will wait until Enable GF Embedded test suite - part 1 (adds missing Derby JDBC driver to GF Embedded All) #24576 is merged and then add a test in the newly enabled GF embedded test suite
• Decide what to do for WebFragmentDescriptor. This solution returns no items for it. Maybe it should return all classes in the nested JAR file referenced from the descriptor.

[OndroMih]

Added test. Now looking at what to do with the WebFragmentDescriptor.

[OndroMih]

I won't have time to fix the WebFragmentDescriptor part any time soon. Since nobody reported any issue with it, I won't fix it in this PR. Instead, I've created a separate issue for it: #24592.

This PR is now ready to be reviewed and merged.

[OndroMih]

@dmatej , @avpinchuk , @ctabin , please review.