[Flaky Test] com.hedera.node.app.service.contract.impl.test.exec.metrics.OpsDurationMetricsTest#transactionOpsDurationMetricsAreRecordedAndRetrieved()

## Flaky Test Detected

| Field | Value |
|---|---|
| Module | `hedera-smart-contract-service-impl` |
| Class | `com.hedera.node.app.service.contract.impl.test.exec.metrics.OpsDurationMetricsTest` |
| Method | `transactionOpsDurationMetricsAreRecordedAndRetrieved()` |
| First detected | 2026-05-18 |
| Workflow | [Node: Build Application #7727](https://github.com/hiero-ledger/hiero-consensus-node/actions/runs/26048583172) |

### Failure Detail (first occurrence)
```
java.lang.AssertionError:
Expecting actual:
140.0580492701754
to be close to:
150.0
by less than 5.0 but difference was 9.9419507298246.
(a difference of exactly 5.0 being considered valid)
at com.hedera.node.app.service.contract.impl@0.74.0-SNAPSHOT/com.hedera.node.app.service.contract.impl.test.exec.metrics.OpsDurationMetricsTest.transactionOpsDurationMetricsAreRecordedAndRetrieved(OpsDurationMetricsTest.java:64)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
```

### Previous Tickets
- #24940 (closed 2026-04-17)