RFR: 7903443: Propagate verbose flag to agents [v3]

[Jonathan Gibbons]

On Thu, 30 May 2024 16:28:43 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this change to make `jtreg` propagate its verbosity configuration to agents.
>> 
>> This pull request also updates the `JUnitRunner` agent to evaluate the verbosity configuration and act accordingly.
>> For example, passing `-v:nopass,error,fail` at the command line to `jtreg` will suppress the `STARTED: ...` and `SUCCESSFUL: ...` lines in `.jtr` files for JUnit-based tests.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert changes in JarManager; they are unrelated

Marked as reviewed by jjg (Lead).

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PR Review: https://git.openjdk.org/jtreg/pull/187#pullrequestreview-2091071638