Removes cap_accounts_data_size_per_block feature

[brooksprumo]

Problem

The cap_accounts_data_size_per_block feature cannot and will not ever be activated. The code has been removed, but before that, it would introduce potential non-determinism. For more information, please refer to #27029

Here's the original feature gate issue: #25517

Now all that remains is the feature itself, and can be safely removed.

PRs that removed code gated by this feature:

• Remove accounts data size checks in blockstore_processor #26776

Summary of Changes

Remove the cap_accounts_data_size_per_block feature

Feature Gate Issue: #25517

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.7%. Comparing base (e8c87e8) to head (8df42e3).

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #35381     +/-   ##
=========================================
- Coverage    81.8%    81.7%   -0.1%     
=========================================
  Files         834      834             
  Lines      224815   224814      -1     
=========================================
- Hits       183919   183874     -45     
- Misses      40896    40940     +44     

[CriesofCarrots]

Same request as on #35378 : please add to the PR description a link to the PR(s) that removed the code gated by this feature before merge.

[t-nelson]

r+ tyera's pr/issue linkage suggestions