WT-14188 Investigate performance of ARMV9 machines

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• Closed

WT-14122 Create an ARMv9 variant for all ARMv8 variants in evergreen.yml

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• Closed

WT-14124 Remove ARMv8 build variants from evergreen after the rollout of ARMv9 in Atlas

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• In Progress

WT-14790 Remove redundant `must_resolve` variable from __wt_session_get_btree_ckpt()

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• Closed

WT-14724 Add a new preserve_prepared connection configuration

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• Closed