Cleanup - Various feature gates

[Lichtso]

Problem

Since epoch 321 (almost a year ago) various features were activated (on all three clusters) but their feature gating logic was never cleaned up.

Summary of Changes

Removes feature gating logic of the following features:

1. vote_withdraw_authority_may_change_authorized_voter
2. limit_secp256k1_recovery_id
3. spl_token_v3_4_0
4. spl_associated_token_account_v1_1_0
5. disable_fee_calculator
6. vote_authorize_with_seed
7. merge_nonce_error_into_system_error
8. instructions_sysvar_owned_by_sysvar
9. require_static_program_ids_in_transaction
10. include_account_index_in_rent_error
11. filter_votes_outside_slot_hashes
12. reject_vote_account_close_unless_zero_credit_epoch
13. bank_transaction_count_fix
14. check_syscall_outputs_do_not_overlap

[CriesofCarrots]

Doing this all in one PR seems like a bad idea to me

[Lichtso]

I can spit it up if you like, but opening 14 PRs did not seem so good either.

[mvines]

I feel separate PRs is the way to go as well. I understand the pain, I know it'll take longer, etc. Reviews for each 14 PR should be pretty obvious though, certainly should tag the original feature-gate author for that review too.
The effort here is very much appreciated though, it's absolutely a net good!

[CriesofCarrots]

I can spit it up if you like, but opening 14 PRs did not seem so good either.

Yeah, what Michael said. Unless any of them are too intertwined with each other, I am in favor of 14 different PRs

[Lichtso]

Ok, let me just get this PR through CI, then I will close it and reopen as split PRs.

[codecov]

Codecov Report

Merging #31750 (e95f530) into master (bc4d53c) will increase coverage by 0.0%.
The diff coverage is 85.8%.

@@           Coverage Diff            @@
##           master   #31750    +/-   ##
========================================
  Coverage    81.8%    81.8%            
========================================
  Files         736      736            
  Lines      205955   205733   -222     
========================================
- Hits       168631   168495   -136     
+ Misses      37324    37238    -86