RFR: JDK-8304557: java/util/concurrent/CompletableFuture/CompletableFutureOrTimeoutExceptionallyTest.java times out [v3]

[Viktor Klang]

> Improves the stability of the memory leak test for CompletableFuture timeout cancellation by both reducing the count by 50% (which should still be above threshold to trigger given the ample margin set initially) as well as extending the default timeout of the test run.

Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:

  Adding an @modules and minor code reformatting

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13116/files
  - new: https://git.openjdk.org/jdk/pull/13116/files/4a5dd8c8..572687a0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13116&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13116&range=01-02

  Stats: 8 lines in 1 file changed: 3 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/13116.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13116/head:pull/13116

PR: https://git.openjdk.org/jdk/pull/13116