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

[Aleksey Shipilev]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25452/files
  - new: https://git.openjdk.org/jdk/pull/25452/files/711a3474..9518cb62

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25452&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25452&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25452.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25452/head:pull/25452

PR: https://git.openjdk.org/jdk/pull/25452