v1.18: Revert partitioned rewards PDA commits (backport of #35088)

[mergify]

This is an automatic backport of pull request #35088 done by Mergify.
Cherry-pick of 57bbd33 has failed:

On branch mergify/bp/v1.18/pr-35088
Your branch is ahead of 'origin/v1.18' by 4 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 57bbd3363c.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   runtime/src/epoch_rewards_hasher.rs
	deleted:    sdk/program/src/epoch_rewards_partition_data.rs
	modified:   sdk/program/src/lib.rs
	modified:   sdk/src/lib.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   runtime/src/bank.rs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (5ca66a3) 81.6% compared to head (a499183) 81.6%.

Additional details and impacted files

@@           Coverage Diff            @@
##            v1.18   #35100    +/-   ##
========================================
  Coverage    81.6%    81.6%            
========================================
  Files         828      827     -1     
  Lines      224100   223997   -103     
========================================
- Hits       182918   182906    -12     
+ Misses      41182    41091    -91