RFR: 8329660: G1: Improve TestGCLogMessages to be more precise

[Ivan Walulya]

On Thu, 11 Apr 2024 13:58:30 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Add colon and Time Format details expected in log messages to the test. Some tools require that these details are maintained.
>> 
>> Testing: tier1
>
> Marked as reviewed by ayang (Reviewer).

Thanks @albertnetymk and @tschatzl for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/18623#issuecomment-2051202496