RFR: 8341551: Revisit jdk.internal.loader.URLClassPath.JarLoader after JEP 486 [v2]

[Jaikiran Pai]

> Can I please get a review of this change which proposes to address https://bugs.openjdk.org/browse/JDK-8341551? 
> 
> The primary work in this PR is the specification of the previously existing `sun.misc.URLClassPath.disableJarChecking` system property and how the internal implementation of `java.net.URLClassLoader` treats it. The complete details about this property is available in the CSR for this change here https://bugs.openjdk.org/browse/JDK-8345394.
> 
> A new jtreg test has been introduced to exercise the usage of this system property.

Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:

  improve code comment

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22545/files
  - new: https://git.openjdk.org/jdk/pull/22545/files/b9ae429c..60416aa5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22545&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22545&range=00-01

  Stats: 3 lines in 1 file changed: 2 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22545.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22545/head:pull/22545

PR: https://git.openjdk.org/jdk/pull/22545