HDDS-15473. TestOmSnapshotObjectStore should run with createLinkedBucket=false

[chihsuan]

What changes were proposed in this pull request?

TestOmSnapshotObjectStore and TestOmSnapshotObjectStoreWithLinkedBuckets both call super(OBJECT_STORE, false, false, false, true). They are therefore identical, and the non-linked OBJECT_STORE` snapshot path is no longer exercised by any test.

ozone/hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/om/snapshot/TestOmSnapshotObjectStore.java

Lines 25 to 30 in 547ac88

	public class TestOmSnapshotObjectStore extends TestOmSnapshot {
	public TestOmSnapshotObjectStore() throws Exception {
	super(OBJECT_STORE, false, false, false, true);
	}
	}

ozone/hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/om/snapshot/TestOmSnapshotObjectStoreWithLinkedBuckets.java

Lines 25 to 30 in dcc6edf

	public class TestOmSnapshotObjectStoreWithLinkedBuckets extends TestOmSnapshot {
	public TestOmSnapshotObjectStoreWithLinkedBuckets() throws Exception {
	super(OBJECT_STORE, false, false, false, true);
	}
	}

This was introduced in HDDS-11705 (#7434), which added TestOmSnapshotObjectStoreWithLinkedBuckets and converted TestOmSnapshotObjectStore's constructor from 4 to 5 arguments, passing true for the new createLinkedBucket flag instead of false.

This PR changes TestOmSnapshotObjectStore to pass createLinkedBucket=false, restoring coverage of the non-linked path. This matches the non-linked/linked pairing that every other layout already has (TestOmSnapshotFsoWithNativeLib vs ...WithLinkedBuckets, TestOmSnapshotWithoutBucketLinkingLegacy vs TestOmSnapshotWithBucketLinkingLegacy).

Noted as a side observation in HDDS-10308, but it is a coverage correctness issue, not a speedup, so address it separately.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-15473

How was this patch tested?

Existing TestOmSnapshotObjectStore integration test, now exercising the non-linked OBJECT_STORE path. Verified via the CI workflow run on the fork. https://github.com/chihsuan/ozone/actions/runs/26890673615/job/79318188405#step:13:5621

[adoroszlai]

Thanks @chihsuan for the patch.