### What changes were proposed in this pull request?
By default, the executor pod prefix is generated by the app name. It handles characters that match [^a-z0-9\\-] differently. The '.' and all whitespaces will be converted to '-', but other ones to empty string. Especially, characters like '_', '|' are commonly used as a word separator in many languages.
According to the K8S DNS Label Names, see https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-label-names, we can convert all special characters to `-`.
For example,
```
scala> "xyz_abc_i_am_a_app_name_w/_some_abbrs".replaceAll("[^a-z0-9\\-]", "-").replaceAll("-+", "-")
res11: String = xyz-abc-i-am-a-app-name-w-some-abbrs
scala> "xyz_abc_i_am_a_app_name_w/_some_abbrs".replaceAll("\\s+", "-").replaceAll("\\.", "-").replaceAll("[^a-z0-9\\-]", "").replaceAll("-+", "-")
res12: String = xyzabciamaappnamewsomeabbrs
```
```scala
scala> "time.is%the￥most$valuable_——————thing,it's about time.".replaceAll("[^a-z0-9\\-]", "-").replaceAll("-+", "-")
res9: String = time-is-the-most-valuable-thing-it-s-about-time-
scala> "time.is%the￥most$valuable_——————thing,it's about time.".replaceAll("\\s+", "-").replaceAll("\\.", "-").replaceAll("[^a-z0-9\\-]", "").replaceAll("-+", "-")
res10: String = time-isthemostvaluablethingits-about-time-
```
### Why are the changes needed?
For better UX
### Does this PR introduce _any_ user-facing change?
yes, the executor pod name might look better
### How was this patch tested?
add new ones
Closes#33171 from yaooqinn/SPARK-35969.
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
94c1e3c38c