set epoch reward pda rent epoch to max

[HaoranYi]

Problem

We deprecated rent accounts on the network. This means all new accounts must be rent exempt. We also activated set_rent_epoch_max feature. One of the implications is that for rent exempt account, its rent_epoch is set to
u64::max. However, currently, reward pda accounts are created rent-exempted but its rent_epoch is set 0. We rely on rent_collect to update to u64::max. In future, when we skip rent collect, the new PDA account's rent epoch will not be updated and stuck to zero.

To fix this, the pda account can simply be created with rent_epoch to u64::max and don't depend on rent collect to update rent_epoch later.

Summary of Changes

• set epoch reward pda accounts rent_epoch to u64::max at creation.

Fixes #

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0e4e81a) 81.6% compared to head (7afff85) 81.6%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #35098     +/-   ##
=========================================
- Coverage    81.6%    81.6%   -0.1%     
=========================================
  Files         831      831             
  Lines      225048   225049      +1     
=========================================
- Hits       183735   183715     -20     
- Misses      41313    41334     +21     

[CriesofCarrots]

Hi @HaoranYi , I reverted the relevant code yesterday (#35088), so this can be closed. In the meantime, I'd like to sync up with you about partitioned rewards; I'll message you directly.

[HaoranYi]

close as it is outdated.