### What changes were proposed in this pull request?
This PR proposes:
- Add `~/.sbt` directory into the build cache, see also https://github.com/sbt/sbt/issues/3681
- Move `hadoop-2` below to put up together with `java-11` and `scala-213`, see https://github.com/apache/spark/pull/30391#discussion_r524881430
- Remove unnecessary `.m2` cache if you run SBT tests only.
- Remove `rm ~/.m2/repository/org/apache/spark`. If you don't `sbt publishLocal` or `mvn install`, we don't need to care about it.
- Use Java 8 in Scala 2.13 build. We can switch the Java version to 11 used for release later.
- Add caches into linters. The linter scripts uses `sbt` in, for example, `./dev/lint-scala`, and uses `mvn` in, for example, `./dev/lint-java`. Also, it requires to `sbt package` in Jekyll build, see: https://github.com/apache/spark/blob/master/docs/_plugins/copy_api_dirs.rb#L160-L161. We need full caches here for SBT, Maven and build tools.
- Use the same syntax of Java version, 1.8 -> 8.
### Why are the changes needed?
- Remove unnecessary stuff
- Cache what we can in the build
### Does this PR introduce _any_ user-facing change?
No, dev-only.
### How was this patch tested?
It will be tested in GitHub Actions build at the current PR
Closes#30391 from HyukjinKwon/SPARK-33464.
Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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