v3.1: consensus: axe the intermediate accumulation pathway for OC (backport of #10594)

[mergify]

Problem

This optimization doesn't actually get us anything and is complex to reason about

Summary of Changes

Remove it and bank hash cache to ibrl

---

This is an automatic backport of pull request #10594 done by Mergify.

[mergify]

Cherry-pick of 207fb1d has failed:

On branch mergify/bp/v3.1/pr-10594
Your branch is up to date with 'origin/v3.1'.

You are currently cherry-picking commit 207fb1d00.
  (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/lib.rs

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   core/src/cluster_info_vote_listener.rs
	both modified:   runtime/src/bank_forks.rs
	deleted by them: runtime/src/bank_hash_cache.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

[t-nelson]

bp ack

[bw-solana]

looks like 100% of conflicts are just tied to migration status not existing. Conflict resolution looks good to me

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (ba0d1f8) to head (faf26c3).

Additional details and impacted files

@@            Coverage Diff            @@
##             v3.1   #10697     +/-   ##
=========================================
- Coverage    83.2%    83.2%   -0.1%     
=========================================
  Files         865      864      -1     
  Lines      376843   376733    -110     
=========================================
- Hits       313801   313705     -96     
+ Misses      63042    63028     -14     

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