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NLA: Remove Hold resetting between Hold_Forward Behavior

Before, moving (or Push-Down Action-ing) a Replace strip with extrap=`Hold or Hold_Forward` will auto reset to the other based on whichever first occurs among all the tracks. Now, that auto reset behavior has been completely removed and //only// that behavior.

This patch does not change strip evaluation. Between two strips, the first with `None` extrapolation and the next with `Hold`, neither strip will evaluate, which matches previous behavior. A future patch can change the evaluation behavior.

Part of {T82230}

Differential Revision: https://developer.blender.org/D9942