RFR: 8365834: Mark java/net/httpclient/ManyRequests.java as intermittent

[SendaoYan]

The test java/net/httpclient/ManyRequests.java has been observed intermittent failure such as https://bugs.openjdk.org/browse/JDK-8327968 and https://bugs.openjdk.org/browse/JDK-8365811. Should we mark this test as `@intermittent`.

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Commit messages:
 - 8365834: Mark java/net/httpclient/ManyRequests.java as intermittent

Changes: https://git.openjdk.org/jdk/pull/26852/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26852&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365834
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26852.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26852/head:pull/26852

PR: https://git.openjdk.org/jdk/pull/26852