type AccountSecondaryIndexes = HashSet (backport #17108)

[mergify]

This is an automatic backport of pull request #17108 done by Mergify.
Cherry-pick of f39dda0 has failed:

On branch mergify/bp/v1.6/pr-17108
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Changes to be committed:
	modified:   accounts-bench/src/main.rs
	modified:   core/src/validator.rs
	modified:   core/tests/snapshots.rs
	modified:   ledger/src/blockstore_processor.rs
	modified:   runtime/benches/accounts_index.rs
	modified:   runtime/src/bank.rs
	modified:   runtime/src/serde_snapshot.rs
	modified:   runtime/src/serde_snapshot/tests.rs
	modified:   runtime/src/snapshot_utils.rs

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

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[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[jeffwashington]

This is a straightforward refactoring required by #17110. We think #17110 will likely need to go into 1.6

[codecov]

Codecov Report

Merging #17149 (894fbed) into v1.6 (094271b) will increase coverage by 0.0%.
The diff coverage is 96.0%.

@@           Coverage Diff           @@
##             v1.6   #17149   +/-   ##
=======================================
  Coverage    82.7%    82.7%           
=======================================
  Files         418      418           
  Lines      115713   115766   +53     
=======================================
+ Hits        95717    95803   +86     
+ Misses      19996    19963   -33