RFR: 8344229: Revisit SecurityManager usage in jdk.httpserver after JEP 486 integration

[Volkan Yazıcı]

Removes `SecurityManager` and friends from `jdk.httpserver`. Will share `tier1..2` results soon.

**Methodology:** Case-insensitively and recursively searched for the occurrences of `("removal"|secu|privi)` in `httpserver`-named folders.

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Commit messages:
 - Remove `SecurityManager` and friends from `jdk.httpserver`

Changes: https://git.openjdk.org/jdk/pull/22510/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22510&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344229
  Stats: 312 lines in 29 files changed: 0 ins; 181 del; 131 mod
  Patch: https://git.openjdk.org/jdk/pull/22510.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22510/head:pull/22510

PR: https://git.openjdk.org/jdk/pull/22510