Fix flaky CI tests

[julienrbrt]

Tracking issue for flaky tests:

• flaky test TestABCI_SnapshotWithPruning/default_pruning_with_snapshot #21595
• Flaky integration v2 test #22736
• Flaky system test #22622

(Similar than previous tracking issue #9010).

[lfz941]

https://github.com/cosmos/cosmos-sdk/actions/runs/10923327156/job/30321733783

Found a new flaky test just now =_=||

--- FAIL: TestSnapshot_Take_Restore (0.01s)
    testing.go:1232: TempDir RemoveAll cleanup: unlinkat /tmp/TestSnapshot_Take_Restore942349753/001: directory not empty
FAIL
coverage: 73.9% of statements
FAIL	cosmossdk.io/store/v2/snapshots	1.183s

[lfz941]

https://github.com/cosmos/cosmos-sdk/actions/runs/10986009322/job/30498740632?pr=21812

Found a new flaky test.

--- FAIL: TestSnapshotter (5.01s)
    snapshotter_test.go:55: 
        	Error Trace:	/home/runner/work/cosmos-sdk/cosmos-sdk/x/auth/ante/unorderedtx/snapshotter_test.go:55
        	Error:      	Not equal: 
        	            	expected: 0
        	            	actual  : 100
        	Test:       	TestSnapshotter
FAIL