RFR: 8355746: Start of release updates for JDK 26

[Nizar Benalla]

On Fri, 2 May 2025 14:48:01 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

> Get JDK 26 underway.

This initial commit of the PR intentionally excludes the creation of the new symbol files so that the fundamental code aspects of the update are easier to see.

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PR Comment: https://git.openjdk.org/jdk/pull/25008#issuecomment-2847422764