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

[Volkan Yazici]

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()`.

I've verified that all relevant occurrences of `std{in,err,out}.encoding` are covered, except the ones `src/java.base/share/classes/java/lang/System.java`, which, I presume, is left out intentionally.

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Marked as reviewed by vyazici (Committer).

PR Review: https://git.openjdk.org/jdk/pull/25860#pullrequestreview-2937989243