RFR: 8367068: Remove redundant HttpRequest.BodyPublisher tests

[Volkan Yazici]

Remove `HttpRequest.BodyPublisher` tests rendered redundant by [JDK-8367067] (#26876).

[JDK-8367067]: https://bugs.openjdk.org/browse/JDK-8367067

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Commit messages:
 - Remove redundant tests

Changes: https://git.openjdk.org/jdk/pull/27421/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27421&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367068
  Stats: 461 lines in 7 files changed: 134 ins; 325 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27421.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27421/head:pull/27421

PR: https://git.openjdk.org/jdk/pull/27421