StakeNet keeper doesn't handle delayed merkle root uploads properly

[buffalu]

Describe the bug
The StakeNet keeper doesn't handle delayed merkle root uploads properly.

If the merkle root upload takes awhile, the keeper doesn't handle that properly and will call copy_tip_distribution_account, which copies u32::MAX over for the MEV rewards. The keeper will then not go back and refresh it.

The keeper should handle this properly; it should account for slow merkle root uploads and ensure that the correct values are copied over