Do not sanity check on reload

[carmocca]

What does this PR do?

When we restart from a checkpoint, we don't want to run the validation sanity check as it can override the current state of the validation loop, which should have been restored if fault-tolerance is enabled.

Part of #8578

Does your PR introduce any breaking changes? If yes, please list them.

None

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cc @Borda @carmocca @justusschock @awaelchli @ninginthecloud @ananthsub

[tchaton]

LGTM! Mind adding a test?