RFR: 8353331: Test ForkJoinPool20Test::testFixedDelaySequence is failing

[Alan Bateman]

ForkJoinPool20Test::testFixedDelaySequence is failing intermittently. The assert that checks that the periodically tasks only executes 8 times is removed, it may run more than this before it cancelled.

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Commit messages:
 - Drop assert

Changes: https://git.openjdk.org/jdk/pull/24353/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24353&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353331
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24353.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24353/head:pull/24353

PR: https://git.openjdk.org/jdk/pull/24353