[jdk18u] RFR: 8286594: (zipfs) Mention paths with dot elements in ZipException and cleanups

[Christoph Langer]

Hi all,

This pull request contains a backport of [JDK-8286594](https://bugs.openjdk.java.net/browse/JDK-8286594), commit [80cf9f34](https://github.com/openjdk/jdk/commit/80cf9f3464c599fb7860432bf4ed506a3b298d8e) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.

The commit being backported was authored by Christoph Langer on 14 May 2022 and was reviewed by Lance Andersen.

Thanks!

-------------

Commit messages:
 - Backport 80cf9f3464c599fb7860432bf4ed506a3b298d8e

Changes: https://git.openjdk.java.net/jdk18u/pull/140/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=140&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286594
  Stats: 73 lines in 1 file changed: 31 ins; 38 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/140.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/140/head:pull/140

PR: https://git.openjdk.java.net/jdk18u/pull/140