Fix metric display for data sizes exceeding TB (#14078)

[winningsix]

Add PB (Petabyte) and EB (Exabyte) units to SizeInBytes.SizeUnitNames to correctly format very large data sizes in metrics.

Previously, data sizes over 1TB would display with large TB values (e.g., 1024.00TB) instead of proper larger units (e.g., 1.00PB).

Fixes #14078

[greptile-apps]

Greptile Summary

Extended SizeInBytes.SizeUnitNames array to include "PB" (Petabyte) and "EB" (Exabyte) units, enabling proper formatting of GPU task metrics for data sizes exceeding 1TB. Previously, values >= 1024TB displayed incorrectly (e.g., "1024.00TB") instead of using larger units (e.g., "1.00PB"). The change is a simple one-line fix that extends the array used by the existing formatting logic in the toString() method.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change is a straightforward extension of an existing string array used for metric display formatting. The existing logic already handles variable-length arrays correctly through the loop condition unitIndex < SizeUnitNames.length. No algorithm changes, no new code paths, and the fix directly addresses the reported issue.
• No files require special attention

Important Files Changed

Filename	Overview
sql-plugin/src/main/scala/org/apache/spark/sql/rapids/GpuTaskMetrics.scala	Added PB and EB units to support formatting data sizes exceeding TB

Sequence Diagram

sequenceDiagram
    participant Metric as GPU Task Metric
    participant Accumulator as SizeInBytesAccumulator
    participant SIB as SizeInBytes
    participant Display as Metric Display

    Accumulator->>SIB: Create SizeInBytes(value)
    Note over SIB: value = raw bytes count
    Display->>SIB: toString()
    
    SIB->>SIB: unitVal = value, unitIndex = 0
    
    loop while unitIndex < SizeUnitNames.length && unitVal >= 1024
        SIB->>SIB: nextUnitVal = unitVal >> 10
        SIB->>SIB: remainVal = unitVal - (nextUnitVal << 10)
        SIB->>SIB: unitVal = nextUnitVal
        SIB->>SIB: unitIndex += 1
    end
    
    Note over SIB: OLD: Array("B", "KB", "MB", "GB", "TB")<br/>NEW: Array("B", "KB", "MB", "GB", "TB", "PB", "EB")
    
    SIB->>SIB: finalVal = (unitVal + remainVal/1024).formatted("%.2f")
    SIB->>SIB: result = finalVal + SizeUnitNames(unitIndex) + " (" + value + " bytes)"
    
    SIB-->>Display: Return formatted string
    
    Note over Display: OLD: 1024.00TB for 1PB<br/>NEW: 1.00PB for 1PB

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[winningsix]

build

[sperlingxx]

LGTM