This getDiffResultsHash() function is returning a set of
reports based on what are they compared to in a "CodeChecker cmd
diff" command. Earlier this function didn't consider false positive
and intentional reports as closed reports. The client's behavior also
changed from CodeChecker 6.20.0 and this behavior is adapted to the
new server behavior. The problem is that the old client works
correcly only with the old server. For this reason we are branching
based on the client's version.