[GR-48230] Use common pool for class loading, analysis, and compilation. #7661
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This PR changes the Native Image builder so that it uses the common pool for class loading, analysis, and compilation tasks. Previously, individual ForkJoinPools were used, which in turn used different thread limits. Using the common pool makes this more uniform (default limit is set to 32 threads) and allows some cleanups. It also made it easier for us to allow
--parallelism=1(single-threaded mode), which can be useful for debugging purposes, because the common pool can be disabled.