RFR: 8278527: java/util/concurrent/tck/JSR166TestCase.java fails nanoTime test

[Jaikiran Pai]

Can I get a review of this change which proposes to remove the `SystemTest` from among the `JSR166TestCase`?

As noted in https://bugs.openjdk.org/browse/JDK-8278527 the `SystemTest.nanoTime` test has been intermittently failing since a few years now. Martin and Paul have investigated this failure in the past and they note that this test is fragile and should be removed:

https://bugs.openjdk.org/browse/JDK-8278527?focusedId=14463658&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14463658

https://bugs.openjdk.org/browse/JDK-8278527?focusedId=14508958&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14508958

The commit in this PR removes the `SystemTest` that was enrolled into `JSR166TestCase`.

tier1 testing went fine with this change.

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Commit messages:
 - 8278527: java/util/concurrent/tck/JSR166TestCase.java fails nanoTime test

Changes: https://git.openjdk.org/jdk/pull/17960/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17960&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8278527
  Stats: 76 lines in 2 files changed: 0 ins; 76 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17960.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17960/head:pull/17960

PR: https://git.openjdk.org/jdk/pull/17960