db_modes_test to nonparallel 📦

[heifner]

Change Description

Label db_modes_test to non_parallelizable_tests so it will be run as its own test in the cloud and not as part of Unit Tests. It was failing frequently on the Mac most likely because too many tests in Unit Tests.

Change Type

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• Documentation

• Stability bug fix

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Testing Changes

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Consensus Changes

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API Changes

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[heifner]

#10669