RFR: 8357797: Use StructuredTaskScopeImpl.ST_NEW for state init [v2]

[Alan Bateman]

On Mon, 26 May 2025 17:17:30 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> SonarCloud complains `ST_NEW` constant is not used. Looks to me the constructor implicitly relies on default value for `state`. It would be cleaner to initialize it explicitly
>> 
>> Additional testing:
>>  - [x] Linux x86_64 server fastdebug, `java/util/concurrent`
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Move to the end

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25452#pullrequestreview-2868916918