add parallelism disabling hook for CpgPass #1748
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This is inspired by joernio/joern#3874
In order to parallelize a pass, it is useful during development to be able to use the ForkJoinParallelCpgPass framework, but without actually parallelizing. Hence this new hook: Do the big code changes for parallelization, but then make it configurable so that only a single line needs to be reverted in case of race conditions.