RFR: 8374432: TimeoutResponseBodyTest.java#retriesEnabledForResponseFailure fails run with -Xcomp

[SendaoYan]

Hi all,

The test test/jdk/java/net/httpclient/TimeoutResponseBodyTest.java#retriesEnabledForResponseFailure  was observed timed out when run with jvm option -Xcomp. The failure details shows in [JDK-8374432](https://bugs.openjdk.org/browse/JDK-8374432). Maybe it need more time for C2 to compile the httpclient classes than the default mixed mode.

So this PR read the timeout factor from jtreg, and apply the timeout factor to `REQUEST_TIMEOUT` by multiply it. Change has been verified locally by run the related tests test/jdk/java/net/httpclient/TimeoutResponseHeaderTest.java and test/jdk/java/net/httpclient/TimeoutResponseBodyTest.java both with -Xmixed and -Xcomp. Test-fix only, no risk,

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Commit messages:
 - 8374432: TimeoutResponseBodyTest.java#retriesEnabledForResponseFailure fails run with -Xcomp

Changes: https://git.openjdk.org/jdk/pull/29012/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29012&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374432
  Stats: 7 lines in 1 file changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/29012.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29012/head:pull/29012

PR: https://git.openjdk.org/jdk/pull/29012