[SPARK-45667][CORE][SQL][CONNECT] Clean up the deprecated API usage related to IterableOnceExtensionMethods.

[LuciferYang]

What changes were proposed in this pull request?

This PR cleans up the use of the following APIs in IterableOnceExtensionMethods, as they have been deprecated after Scala 2.13.0:

• .toSeq -> .iterator.to(Seq)
• .toIterable -> .iterator.to(Iterable)
• .toTraversable -> .iterator.to(Iterable)
• .toArray -> .iterator.toArray
• .map -> .iterator.map
• .foreach -> .iterator.foreach
• .isEmpty -> .iterator.isEmpty

  @deprecated("Use .iterator.to(Seq) instead", "2.13.0")
  @`inline` def toSeq: immutable.Seq[A] = immutable.Seq.from(it)

  @deprecated("Use .iterator.to(Iterable) instead", "2.13.0")
  @`inline` final def toIterable: Iterable[A] = Iterable.from(it)

  @deprecated("Use .iterator.to(Iterable) instead", "2.13.0")
  @`inline` final def toTraversable: Traversable[A] = toIterable

  @deprecated("Use .iterator.toArray", "2.13.0")
  def toArray[B >: A: ClassTag]: Array[B] = it match {
    case it: Iterable[B] => it.toArray[B]
    case _ => it.iterator.toArray[B]
  }

  @deprecated("Use .iterator.map instead or consider requiring an Iterable", "2.13.0")
  def map[B](f: A => B): IterableOnce[B] = it match {
    case it: Iterable[A] => it.map(f)
    case _ => it.iterator.map(f)
  }

  @deprecated("Use .iterator.foreach(...) instead", "2.13.0")
  @`inline` def foreach[U](f: A => U): Unit = it match {
    case it: Iterable[A] => it.foreach(f)
    case _ => it.iterator.foreach(f)
  }

  @deprecated("Use .iterator.isEmpty instead", "2.13.0")
  def isEmpty: Boolean = it match {
    case it: Iterable[A] => it.isEmpty
    case _ => it.iterator.isEmpty
  }

Why are the changes needed?

Clean up deprecated API usage.

Does this PR introduce any user-facing change?

No

How was this patch tested?

Pass GitHub Acitons.

Was this patch authored or co-authored using generative AI tooling?

No

[beliefer]

LGTM.

[dongjoon-hyun]

+1, LGTM. Are these all occurrences?

[LuciferYang]

Yes, all the cases related to IterableOnceExtensionMethods are here.

[LuciferYang]

Merged into master for Spark 4.0. Thanks @dongjoon-hyun @beliefer