Revert "WT-12768 Implement deterministic mid-checkpoint crashes in RTS Model (#11238)

[raviprakashgiri29]

This reverts commit 2b42c67.

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[wiredtiger-prbot]

Metric (for added/changed code)	Coverage
Line coverage	100% (4/4)
Branch coverage	N/A

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[kommiharibabu]

LGTM