Add support for disk spill metrics in Photon jobs

[parthosa]

Issue #251

Following up on #1390, this PR adds parsing for Disk Spill Size metrics for Photon Jobs.

• Photon event logs report disk spill size using the metric name "num bytes spilled to disk".
• Similar to 1390, we now calculate the disk spill size using accumulators instead of task metrics for Photon jobs.
• Note: Could not find any metrics for in-memory spills in Photon event logs.

Changes

Enhancements to Photon-specific metrics handling:

• core/src/main/scala/com/nvidia/spark/rapids/tool/analysis/AppSparkMetricsAnalyzer.scala: Use a HashMap to store Metric -> Accumulator and added support for disk spill size metrics. [1] [2]
• core/src/main/scala/com/nvidia/spark/rapids/tool/planparser/DatabricksParseHelper.scala: Added a new label for disk spill size metrics.

Test expectation updates:

• core/src/test/resources/ProfilingExpectations/nds_q88_photon_db_13_3_job_metrics_agg_expectation.csv: Updated to include disk spill size metrics.
• core/src/test/resources/ProfilingExpectations/nds_q88_photon_db_13_3_sql_metrics_agg_expectation.csv: Updated to include disk spill size metrics.
• core/src/test/resources/ProfilingExpectations/nds_q88_photon_db_13_3_stage_metrics_agg_expectation.csv: Updated to include disk spill size metrics.
• Updated event log nds_q88_photon_db_13_3.zstd to include spill metrics

[parthosa]

This PR is no more required since spill metrics are parsed correctly by default.