blockstore: Remove slow test_purge_huge

[steviez]

Problem

test_purge_huge is a slow test. We have the same correctness coverage with below test:

agave/ledger/src/blockstore/blockstore_purge.rs

Lines 527 to 551 in bf93218

	#[test]
	fn test_purge_slots() {
	let ledger_path = get_tmp_ledger_path_auto_delete!();
	let blockstore = Blockstore::open(ledger_path.path()).unwrap();
	let (shreds, _) = make_many_slot_entries(0, 50, 5);
	blockstore.insert_shreds(shreds, None, false).unwrap();
	blockstore.purge_and_compact_slots(0, 5);
	test_all_empty_or_min(&blockstore, 6);
	blockstore.purge_and_compact_slots(0, 50);
	// min slot shouldn't matter, blockstore should be empty
	test_all_empty_or_min(&blockstore, 100);
	test_all_empty_or_min(&blockstore, 0);
	blockstore
	.slot_meta_iterator(0)
	.unwrap()
	.for_each(|(_, _)| {
	panic!();
	});
	}

So, the only "value" remaining for this test is as a "bench". CI isn't the right place for that as the results will be noisy from all the tests running in parallel. Additionally, we significantly optimized purge a while back (solana-labs#26651); it'd hypothetically be nice to have a guard to ensure we don't make it worse again but this CI test isn't that so this isn't a reason to hang onto the test either

Solution

Rip the test and give everyone their 2-3 minutes / CI run back

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.6%. Comparing base (44d181a) to head (b714bac).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #9087     +/-   ##
=========================================
- Coverage    82.6%    82.6%   -0.1%     
=========================================
  Files         888      888             
  Lines      320595   320595             
=========================================
- Hits       265105   265073     -32     
- Misses      55490    55522     +32     

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