QueryParser.jj produces code that will not compile

There are 2 problems that have crept into the parser generation system.

1. SOLR-8764 removed deprecated methods that are part of a generated interface (and the implementation thereof). It's kind of stinky that Javacc is generating an interface that includes deprecated methods, but deleting them from the generated class means that re-generation causes compiler errors, so this should probably be reverted.
2. SOLR-11662 changed the signature of org.apache.solr.parser.QueryParser#newFieldQuery to add a parameter, but did not update the corresponding portion of the QueryParser.jj file, and so the method signature reverts upon regeneration, causing compile errors.
3. There are a few places where string concatenation was turned to .append()

The pull request to be attached soon fixes these two issues such that running ant javacc-QueryParser will once again produce code that compiles.