[SPARK-36021][SQL][FOLLOWUP] DT/YM func use field byte to keep consistence

[AngersZhuuuu]

What changes were proposed in this pull request?

With more thought, all DT/YM function use field byte to keep consistence is better

Why are the changes needed?

Keep code consistence

Does this PR introduce any user-facing change?

No

How was this patch tested?

Not need

[AngersZhuuuu]

@MaxGekk @cloud-fan Should we keep IntervalUnit now after we have DT/YM field byte now? after this pr's code, it's only usage is as string value

  object IntervalUnit extends Enumeration {
    type IntervalUnit = Value

    val NANOSECOND = Value(0, "nanosecond")
    val MICROSECOND = Value(1, "microsecond")
    val MILLISECOND = Value(2, "millisecond")
    val SECOND = Value(3, "second")
    val MINUTE = Value(4, "minute")
    val HOUR = Value(5, "hour")
    val DAY = Value(6, "day")
    val WEEK = Value(7, "week")
    val MONTH = Value(8, "month")
    val YEAR = Value(9, "year")
  }

[SparkQA]

Kubernetes integration test unable to build dist.

exiting with code: 1
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45283/

[SparkQA]

Test build #140771 has finished for PR 33252 at commit 9e07e88.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[AngersZhuuuu]

retest this please

[SparkQA]

Kubernetes integration test unable to build dist.

exiting with code: 1
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45285/

[SparkQA]

Test build #140773 has finished for PR 33252 at commit 9e07e88.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #140776 has finished for PR 33252 at commit 0582bda.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[AngersZhuuuu]

retest this please

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45288/

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45290/

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45288/

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/45290/

[MaxGekk]

Should we keep IntervalUnit now after we have DT/YM field byte now?

@AngersZhuuuu If it is possible, let's delete it (in another PR).

[SparkQA]

Test build #140778 has finished for PR 33252 at commit 0582bda.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.