RFR: 8376089: Increase QUIC idle timeout in H3FixedThreadPoolTest to collect more diagnostic [v2]

[Volkan Yazici]

> This test failed on Tier 7, but the failure could not be reproduced. Increase the QUIC idle timeout to a value higher than the JTreg on Tier 7 so that, if the client becomes wedged again, the JTreg timeout handlers can collect more diagnostic information.

Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:

  Remove `@bug` entry

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29358/files
  - new: https://git.openjdk.org/jdk/pull/29358/files/9ea1a232..15e20a6c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29358&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29358&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29358.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29358/head:pull/29358

PR: https://git.openjdk.org/jdk/pull/29358