Chia-Network / chia-blockchain / 18794080568

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 filelock for test- plots and blocks (#20193)

* introduce file lock for creating the test-plots in tests. This avoids having every process in pytest-xdist create the same plots, clobbering each other

* add lockfile to the test fixtures that generate the test blockchains. These are quite expensive to generate, we don't want every pytest-xdist process to have to do it

* improve error message when the plot manager has an unexpected number of plots, in the simulator

* review comments: use FileLock instead of custom made

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