RFR: JDK-8303476: Add the runtime version in the release file of a JDK image

[Mandy Chung]

On Wed, 1 Mar 2023 21:20:18 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> I can't actually find that in the current release file, but that shouldn't prevent us from adding the full version string.

`JAVA_VERSION` is added by jlink and not in ReleaseFile.gmk.

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PR: https://git.openjdk.org/jdk/pull/12813