Perform conversions from microsecond to second correctly

[sundargates]

Context

Explain context and other details for this pull request.

Checklist

• ./gradlew build compiles code correctly
• Added new tests where applicable
• ./gradlew test passes all tests
• Extended README or added javadocs where applicable

[github-actions]

Test Results

488 tests   - 52   479 ✔️  - 53   2m 48s ⏱️ - 2m 55s
106 suites  - 20       8 💤 ±  0 
106 files    - 20       1 ❌ +  1 

For more details on these failures, see this check.

Results for commit 113ca0f. ± Comparison against base commit f9a3261.

This pull request removes 52 tests.

io.mantisrx.server.worker.DataDroppedPayloadSetterTest ‑ testAggregateDropOperatorMetrics
io.mantisrx.server.worker.HeartbeatTest ‑ testSingleUsePayloads
io.mantisrx.server.worker.WorkerExecutionOperationsNetworkStageTest ‑ convertJobSchedulingInfoToWorkerMapInvalidInputTest
io.mantisrx.server.worker.WorkerExecutionOperationsNetworkStageTest ‑ convertJobSchedulingInfoToWorkerMapTest
io.mantisrx.server.worker.WorkerExecutionOperationsNetworkStageTest ‑ deferTest
io.mantisrx.server.worker.client.MetricsClientImplTest ‑ testMetricConnections
io.mantisrx.server.worker.client.SseWorkerConnectionFunctionTest ‑ testSseConnection
io.mantisrx.server.worker.client.SseWorkerConnectionTest ‑ testStreamContentDrops
io.mantisrx.server.worker.config.WorkerConfigurationTest ‑ testMoreThanOneKeyValuePair
io.mantisrx.server.worker.config.WorkerConfigurationTest ‑ testTaskExecutorAttributesWhenASingleValueKVPairIsPassed
…