RFR: 8378595: Refactor miscellaneous tests under test/jdk/java/net/httpclient from TestNG to JUnit [v2]

[Daniel Fuchs]

> A small changeset to convert TestNG tests under `test/jdk/java/net/httpclient/security`, `test/jdk/java/net/httpclient/offline`, and `test/jdk/java/net/httpclient/PathSubscriber` to JUnit.

Daniel Fuchs 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:

 - Review feedback
 - Merge branch 'master' into junit-httpclient-misc-8378595
 - 8378595: Refactor miscellaneous tests under test/jdk/java/net/httpclient from TestNG to JUnit

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29900/files
  - new: https://git.openjdk.org/jdk/pull/29900/files/a6465d7f..351ba8a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29900&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29900&range=00-01

  Stats: 1962 lines in 98 files changed: 1299 ins; 241 del; 422 mod
  Patch: https://git.openjdk.org/jdk/pull/29900.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29900/head:pull/29900

PR: https://git.openjdk.org/jdk/pull/29900