RFR: 8359732: Make standard i/o encoding related system properties `StaticProperty`

[Roger Riggs]

On Tue, 17 Jun 2025 20:16:05 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Refactored the internal handling of `stdin/out/err.encoding` to allow setting them only via command-line options by converting them into `StaticProperty`. This change prevents unexpected behavior caused by applications modifying these properties at runtime using `System.setProperty()`.

Static properties should not be used outside of java.base.
The "for internal use only" should have said "java.base internal use only"
Adding a comment to that effect would be a good idea.

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Changes requested by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25860#pullrequestreview-2939624079