[jdk11u-dev] RFR: 8229867: Re-examine synchronization usages in http and https protocol handlers [v2]

[PoojaDP-23]

> This is a backport request and this fix is a dependency for [8293562](https://github.com/openjdk/jdk/commit/03f25a9c6924430ec4063b801b2b6ca55b9067c9).
> 
> This is a fix that upgrades the old HTTP and HTTPS legacy stack to use virtual-thread friendly locking instead of synchronized monitors.
> 
> We have removed @java.io.serial in AuthenticationInfo.java since the serial.class file not located.

PoojaDP-23 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 four additional commits since the last revision:

 - Merge branch 'master' into jdk11-keepalive
 - address whitespace error
   
   Signed-off-by: Pooja.D.P <Pooja.D.P1 at ibm.com>
 - address compilation error @java.io.Serial
   
   Signed-off-by: Pooja.D.P <Pooja.D.P1 at ibm.com>
 - Backport 65393a093c6a43a0bd8ff9f79c29c3bc5756104f
   
   Signed-off-by: Pooja.D.P <Pooja.D.P1 at ibm.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1710/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1710/files/822d883f..8084ffc4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1710&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1710&range=00-01

  Stats: 18329 lines in 250 files changed: 14986 ins; 1345 del; 1998 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1710.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1710/head:pull/1710

PR: https://git.openjdk.org/jdk11u-dev/pull/1710