v4.0: blockstore: Remove support for deprecated special columns (backport of #11455)

[mergify]

Problem

The TransactionStatus, TransactionMemos, and AddressSignatures columns use to have a u64 in their key format. That u64 was used for the cleaning (compaction) mechanism and pertained to an entry in the TransactionStatusIndex column.

When these columns were rekeyed to drop the u64, logic was added to find values with both the old and new key format in order to support the transition. But, the old format hasn't been written for years so it is reasonable to drop support for it now.

Summary of Changes

This change removes the TransactionStatusIndex column and drops support for reading the old key formats in the transaction metadata columns.

Reference PR's of interest:

• Remove primary index from Blockstore special-column keys solana-labs/solana#33419 introduced the new key format (v1.18)
• Blockstore: clean/save old TransactionMemos sensibly solana-labs/solana#33678 introduced clean_slot_0

v4.0 Backport

I'd like to propose backporting this change to v4.0. While not critical (ie no key bugs fixed), we already have several breaking changes in v4.0 that will disallow v4.0 from reading old blockstores. It is nice to have all of those in one version IMO.

And while the line count is high, the PR is ~90% red lines

---

This is an automatic backport of pull request #11455 done by Mergify.

[mergify]

Cherry-pick of e43b0de has failed:

On branch mergify/bp/v4.0/pr-11455
Your branch is up to date with 'origin/v4.0'.

You are currently cherry-picking commit e43b0dee1.
  (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:   CHANGELOG.md
	modified:   ledger-tool/src/blockstore.rs
	modified:   ledger/src/blockstore/column.rs
	modified:   ledger/src/blockstore_meta.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ledger/src/blockstore.rs
	both modified:   ledger/src/blockstore/blockstore_purge.rs
	both modified:   ledger/src/blockstore_db.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

[steviez]

The cherry-pick wasn't clean due to a couple minor issues (v4.1 has extra AG columns, v4.1 shifted column ordering, etc), but fixup has the line counts matching exactly. I manually reviewed and diff looks to be identical. Force push after was to pickup tip of v4.0 to clear rustsec warnings

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.57143% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.0%. Comparing base (f53b246) to head (e336e31).

Additional details and impacted files

@@            Coverage Diff            @@
##             v4.0   #11468     +/-   ##
=========================================
- Coverage    83.0%    83.0%   -0.1%     
=========================================
  Files         838      838             
  Lines      317202   316643    -559     
=========================================
- Hits       263578   263019    -559     
  Misses      53624    53624             

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.