RFR: 8344229: Revisit SecurityManager usage in jdk.httpserver after JEP 486 integration [v3]

[Volkan Yazıcı]

> Removes `SecurityManager` and friends from `jdk.httpserver`. Successful `tier1..2` results are attached to the ticket.
> 
> **Methodology:** Case-insensitively and recursively searched for the occurrences of `("removal"|secu|privi)` in `httpserver`-named folders.

Volkan Yazıcı has updated the pull request incrementally with one additional commit since the last revision:

  Keep the overflow

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22510/files
  - new: https://git.openjdk.org/jdk/pull/22510/files/32fe1457..518f1eeb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22510&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22510&range=01-02

  Stats: 5 lines in 1 file changed: 1 ins; 0 del; 4 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