RFR: 8344222: Remove calls to SecurityManager and doPrivileged in java.net.HttpURLConnection, java.net.HttpConnectSocketImpl, and javax.net.HttpsURLConnection after JEP 486 integration

[Volkan Yazıcı]

Addresses [8344222](https://bugs.openjdk.org/browse/JDK-8344222) and removes `SecurityManager` and `doPrivileged()` usages from `Http(s)URLConnection` and `HttpConnectSocketImpl`. `tier2` and `tier3` results are on their way.

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Commit messages:
 - Remove `SM` et al. from `HttpURLConnection`, `HttpConnectSocketImpl`, and `HttpsURLConnection`

Changes: https://git.openjdk.org/jdk/pull/22326/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22326&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344222
  Stats: 66 lines in 4 files changed: 1 ins; 59 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22326.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22326/head:pull/22326

PR: https://git.openjdk.org/jdk/pull/22326