Build: make JMH harness JDK 17-clean (module opens, configurable heap, failOnError)

[vaquarkhan]

What

Update jmh.gradle so the benchmark suite runs on a clean JDK 17 checkout:

• add the --add-opens set Spark 4.x needs (sun.util.calendar, nio, security, concurrent)
• make heap configurable: -PjmhHeap (default preserved at 32g)
• make failOnError configurable: -PjmhFailOnError (default preserved at true)

Why

On JDK 17 the read-path benchmarks throw IllegalAccessException (sun.util.calendar) at warm-up, and the full-scale PlanningBenchmark WithStats OOMs at 32g. Contributors currently cannot reproduce benchmarks without local edits. See #17330.

Testing

• JDK 17: ./gradlew help, ./gradlew spotlessApply, ./gradlew :iceberg-core:jmhClasses succeed with the updated harness
• Defaults unchanged for existing users: heap 32g, failOnError true unless -P flags are passed
• JDK 21: --add-opens remain inert via -XX:+IgnoreUnrecognizedVMOptions

Closes #17330

[vaquarkhan]

I hit this issue while running the Spark benchmarks on JDK 17 (Corretto 17.0.19). Every read-path benchmark I
tried died at the first warm-up iteration because Spark reflects into sun.util.calendar and that package
is not opened by default on JDK 17:

# Warmup Iteration   1: <failure>
java.lang.IllegalAccessException: symbolic reference class is not accessible:
  class sun.util.calendar.ZoneInfo, from interface
  org.apache.spark.sql.catalyst.util.SparkDateTimeUtils (unnamed module)
    at org.apache.spark.sql.catalyst.util.SparkDateTimeUtils.toJavaDate(SparkDateTimeUtils.scala:304)
    at org.apache.iceberg.spark.source.IcebergSourceBenchmark.appendAsFile(IcebergSourceBenchmark.java:136)
    at org.apache.iceberg.spark.source.IcebergSourceDeleteBenchmark.setupBenchmark(IcebergSourceDeleteBenchmark.java:73)

Once I added --add-opens=java.base/sun.util.calendar=ALL-UNNAMED (what this PR does) the benchmarks got
past warm-up and finished normally. Here is one running to completion after the fix:

# Warmup Iteration   1: 2.387 s/op
Iteration   1: 2.047 s/op
Iteration   2: 2.058 s/op
Iteration   3: 2.035 s/op
Iteration   4: 2.015 s/op
Iteration   5: 2.051 s/op
  mean = 2.041 ±(99.9%) 0.065 s/op

I also ran into the 32g heap limit on the full-scale PlanningBenchmark ...WithStats at the default 1.5M
file scale. It only completed after I raised the heap well above 32g (I ran the full-scale case at -Xmx220g
on a larger box and it finished with no OOM), which is why I made the heap configurable via -PjmhHeap in
this change.

On JDK 17 I confirmed ./gradlew help, ./gradlew spotlessApply, and ./gradlew :iceberg-core:jmhClasses
all pass with the updated harness, and the defaults are unchanged if you do not pass any -P flags.

Stack trace from the failing run (framework frames trimmed, marked with ...; otherwise verbatim)

org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0) (executor driver): java.lang.IllegalAccessException: symbolic reference class is not accessible: class sun.util.calendar.ZoneInfo, from interface org.apache.spark.sql.catalyst.util.SparkDateTimeUtils (unnamed module @50de0926)
	at java.base/java.lang.invoke.MemberName.makeAccessException(MemberName.java:955)
	at java.base/java.lang.invoke.MethodHandles$Lookup.checkSymbolicClass(MethodHandles.java:3686)
	at java.base/java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:3646)
	at java.base/java.lang.invoke.MethodHandles$Lookup.findVirtual(MethodHandles.java:2680)
	at org.apache.spark.sql.catalyst.util.SparkDateTimeUtils.org$apache$spark$sql$catalyst$util$SparkDateTimeUtils$$getOffsetsByWallHandle(SparkDateTimeUtils.scala:280)
	at org.apache.spark.sql.catalyst.util.DateTimeUtils$.org$apache$spark$sql$catalyst$util$SparkDateTimeUtils$$getOffsetsByWallHandle(DateTimeUtils.scala:41)
	at org.apache.spark.sql.catalyst.util.SparkDateTimeUtils.toJavaDate(SparkDateTimeUtils.scala:304)
	at org.apache.spark.sql.catalyst.util.SparkDateTimeUtils.toJavaDate$(SparkDateTimeUtils.scala:299)
	at org.apache.spark.sql.catalyst.util.DateTimeUtils$.toJavaDate(DateTimeUtils.scala:41)
	at org.apache.spark.sql.catalyst.util.DateTimeUtils.toJavaDate(DateTimeUtils.scala)
	at org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificSafeProjection.apply(Unknown Source)
	at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
	at org.apache.spark.sql.connector.write.DataWriter.writeAll(DataWriter.java:107)
	at org.apache.spark.sql.execution.datasources.v2.DataWritingSparkTask$.run(WriteToDataSourceV2Exec.scala:631)
	... spark scheduler and executor frames ...
	at org.apache.spark.sql.classic.DataFrameWriter.save(DataFrameWriter.scala:115)
	at org.apache.iceberg.spark.source.IcebergSourceBenchmark.appendAsFile(IcebergSourceBenchmark.java:136)
	at org.apache.iceberg.spark.source.IcebergSourceDeleteBenchmark.writeData(IcebergSourceDeleteBenchmark.java:189)
	at org.apache.iceberg.spark.source.parquet.IcebergSourceParquetEqDeleteBenchmark.appendData(IcebergSourceParquetEqDeleteBenchmark.java:43)
	at org.apache.iceberg.spark.source.IcebergSourceDeleteBenchmark.setupBenchmark(IcebergSourceDeleteBenchmark.java:73)
	... jmh runner frames ...
Caused by: java.lang.IllegalAccessException: symbolic reference class is not accessible: class sun.util.calendar.ZoneInfo, from interface org.apache.spark.sql.catalyst.util.SparkDateTimeUtils (unnamed module @50de0926)
	at java.base/java.lang.invoke.MemberName.makeAccessException(MemberName.java:955)
	at java.base/java.lang.invoke.MethodHandles$Lookup.findVirtual(MethodHandles.java:2680)
	at org.apache.spark.sql.catalyst.util.SparkDateTimeUtils.toJavaDate(SparkDateTimeUtils.scala:304)
	... 3 more

The failing run's VM options did not include sun.util.calendar:

-Xmx100g --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.nio=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/sun.nio.ch=ALL-UNNAMED --add-opens=java.base/sun.security.action=ALL-UNNAMED