RFR: 8260555: Change the default TIMEOUT_FACTOR from 4 to 1 [v3]

[SendaoYan]

On Mon, 18 Aug 2025 09:15:29 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> It is unclear to me if the author meant this to be `2.5` more than normal or `10` more than JTREG default, or a `multiplier that seems to work`. It does not bother me _more_ if it is a `10` then a `2.5`, as it needs to have a value that is not the multiplicative identity value. I will not change this, the change I have made is already large enough and I want this to be integrated ASAP.
>
> It is also something that can be changed later, in a follow up fix.

Take test test/hotspot/jtreg/compiler/arraycopy/stress/TestStressArrayCopy.java as example.
If there is a bug in jvm with -Xcomp option which will cause this test run time outed. Before this PR, it will take `7200*10` seconds to run this test finish and report time outed failure. But after this PR, it will take `28800*10` seconds to run this test finish ang then report timed out failure. I think the `28800*10` senonds too long and it's unacceptable.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26749#discussion_r2283972732