Fix writing checkpoint with deletion vector in Delta Lake

[chenjian2664]

Description

Currently, Delta Lake connector writes malformed checkpoint file when the deletion vector is enabled.

Writing checkpoint with error message:

java.lang.IllegalArgumentException: Expected sizeInBytes for field 4 but got Optional[cardinality] for type row(storageType varchar, pathOrInlineDv varchar, offset integer, sizeInBytes integer, cardinality bigint)
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:483)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.validateAndGetField(CheckpointWriter.java:640)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.writeLong(CheckpointWriter.java:571)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.lambda$writeDeletionVector$0(CheckpointWriter.java:451)
	at io.trino.spi.block.RowBlockBuilder.buildEntry(RowBlockBuilder.java:111)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.writeDeletionVector(CheckpointWriter.java:447)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.lambda$writeAddFileEntry$0(CheckpointWriter.java:334)
	at io.trino.spi.block.RowBlockBuilder.buildEntry(RowBlockBuilder.java:111)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.writeAddFileEntry(CheckpointWriter.java:299)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.lambda$write$4(CheckpointWriter.java:169)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter$CheckpointPageWriter.addEntry(CheckpointWriter.java:199)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.write(CheckpointWriter.java:169)
	at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriterManager.writeCheckpoint(CheckpointWriterManager.java:170)
	at io.trino.plugin.deltalake.DeltaLakeMetadata.writeCheckpointIfNeeded(DeltaLakeMetadata.java:3178)
	at io.trino.plugin.deltalake.DeltaLakeMetadata.finishMerge(DeltaLakeMetadata.java:2693)
	at io.trino.plugin.base.classloader.ClassLoaderSafeConnectorMetadata.finishMerge(ClassLoaderSafeConnectorMetadata.java:1222)
	at io.trino.tracing.TracingConnectorMetadata.finishMerge(TracingConnectorMetadata.java:770)
	at io.trino.metadata.MetadataManager.finishMerge(MetadataManager.java:1336)
	at io.trino.tracing.TracingMetadata.finishMerge(TracingMetadata.java:830)
	at io.trino.sql.planner.LocalExecutionPlanner.lambda$createTableFinisher$0(LocalExecutionPlanner.java:4226)
	at io.trino.operator.TableFinishOperator.getOutput(TableFinishOperator.java:316)
	at io.trino.operator.Driver.processInternal(Driver.java:403)
	at io.trino.operator.Driver.lambda$process$0(Driver.java:306)
	at io.trino.operator.Driver.tryWithLock(Driver.java:709)
	at io.trino.operator.Driver.process(Driver.java:298)
	at io.trino.operator.Driver.processForDuration(Driver.java:269)
	at io.trino.execution.SqlTaskExecution$DriverSplitRunner.processFor(SqlTaskExecution.java:889)
	at io.trino.execution.executor.dedicated.SplitProcessor.run(SplitProcessor.java:77)
	at io.trino.execution.executor.dedicated.TaskEntry$VersionEmbedderBridge.lambda$run$0(TaskEntry.java:201)
	at io.trino.$gen.Trino_testversion____20250708_034624_1.run(Unknown Source)
	at io.trino.execution.executor.dedicated.TaskEntry$VersionEmbedderBridge.run(TaskEntry.java:202)
	at io.trino.execution.executor.scheduler.FairScheduler.runTask(FairScheduler.java:177)
	at io.trino.execution.executor.scheduler.FairScheduler.lambda$submit$0(FairScheduler.java:164)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:545)
	at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:128)
	at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:74)
	at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:80)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1095)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:619)
	at java.base/java.lang.Thread.run(Thread.java:1447)
	Suppressed: java.lang.IllegalStateException: Declared positions (3) does not match block 0's number of entries (2)
		at io.trino.spi.PageBuilder.build(PageBuilder.java:161)
		at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter$CheckpointPageWriter.flush(CheckpointWriter.java:209)
		at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter$CheckpointPageWriter.close(CheckpointWriter.java:218)
		at io.trino.plugin.deltalake.transactionlog.checkpoint.CheckpointWriter.write(CheckpointWriter.java:158)

Steps to reproduce:

CREATE TABLE t (x int) WITH (deletion_vectors_enabled = true, checkpoint_interval = 2);
INSERT INTO t VALUES 1, 2;

-- write the checkpoint, you will see the error in the connector, but it doesn't fails the query

DELETE FROM t WHERE x = 2; 

Additional context and related issues

Release notes

## Delta Lake
* Fix writing malformed checkpoint files when deletion vector is enabled. ({issue}`26145`)

[ebyhr]

Looks good except for comments. Could you fix CI failures?

Error:  src/test/java/io/trino/plugin/deltalake/TestDeltaLakeBasic.java:[89,8] (imports) UnusedImports: Unused import - java.util.function.Predicate.