[Spark] Fix double-use iterator bug (delta-io#4367)

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#### Which Delta project/connector is this regarding?
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- [x] Spark
- [ ] Standalone
- [ ] Flink
- [ ] Kernel
- [ ] Other (fill in here)

## Description

A previous refactoring delta-io#4314
introduced a bug that may cause an iterator to be used more than once.
This PR fix this issue.

## How was this patch tested?
Existing tests

## Does this PR introduce _any_ user-facing changes?
No

Author: ctring

spark/src/main/scala/org/apache/spark/sql/delta/OptimisticTransaction.scala

@@ -1454,7 +1454,7 @@ trait OptimisticTransactionImpl extends DeltaTransaction
         throw e
     }
 
-    runPostCommitHooks(version, postCommitSnapshot, actualCommittedActions.toIterator)
+    runPostCommitHooks(version, postCommitSnapshot, actualCommittedActions)
 
     executionObserver.transactionCommitted()
     Some(version)
@@ -2683,15 +2683,16 @@ trait OptimisticTransactionImpl extends DeltaTransaction
   protected def runPostCommitHooks(
       version: Long,
       postCommitSnapshot: Snapshot,
-      committedActions: Iterator[Action]): Unit = {
+      committedActions: Seq[Action]): Unit = {
     assert(committed, "Can't call post commit hooks before committing")
 
     // Keep track of the active txn because hooks may create more txns and overwrite the active one.
     val activeCommit = OptimisticTransaction.getActive()
     OptimisticTransaction.clearActive()
 
     try {
-      postCommitHooks.foreach(runPostCommitHook(_, version, postCommitSnapshot, committedActions))
+      postCommitHooks.foreach(
+        runPostCommitHook(_, version, postCommitSnapshot, committedActions.toIterator))
     } finally {
       activeCommit.foreach(OptimisticTransaction.setActive)
     }