SERVER-47538 `runMongoProgram` should omit auth options on multiversion mongod binaries

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WT-5964 4.2 unable to open properly downgraded 4.4 datafiles

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WT-5934 Stop validating timestamps read from disk in 4.2

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WT-6011 Bump the compatibility version for MongoDB v4.5 to distinguish from 4.4

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SERVER-48082 WT clean shutdown should do a quick exit before shouldDowngrade() check if the node is still not safe to take stable checkpoints.

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