RFR: 8359223: HttpClient: Remove leftovers from the SecurityManager cleanup [v2]

[Volkan Yazici]

> Removes following files added in [JDK-8235459](https://bugs.openjdk.org/browse/JDK-8235459) and are forgotten to be removed during the `SecurityManager`-removal ([JDK-8344228](https://bugs.openjdk.org/browse/JDK-8344228)):
> 
> 
> test/jdk/java/net/httpclient/FilePublisher/FilePublisherPermsTest.java
> test/jdk/java/net/httpclient/FilePublisher/SecureZipFSProvider.java

Volkan Yazici has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Move `FilePublisherTest` one level up
 - Merge remote-tracking branch 'upstream/master' into hcSmFollowUp
 - Remove leftover tests from the SecurityManager cleanup

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25747/files
  - new: https://git.openjdk.org/jdk/pull/25747/files/4a911af9..8eb99336

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25747&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25747&range=00-01

  Stats: 10935 lines in 147 files changed: 8513 ins; 1685 del; 737 mod
  Patch: https://git.openjdk.org/jdk/pull/25747.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25747/head:pull/25747

PR: https://git.openjdk.org/jdk/pull/25747