RFR: 8345048: Remove the jmx.extend.open.types compatibility property

[Chris Plummer]

On Thu, 16 Jan 2025 12:20:14 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> Classes should not override javax.management.openmbean.OpenType.getClassName(), and this was made illegal (caused an Exception) in JDK6.  A System Property jmx.extend.open.types was introduced to allow such an override, for compatibility reasons.
> 
> This was not documented but was mentioned in the Exception message.
> 
> This compatibility convenience flag should be removed.

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23151#pullrequestreview-2557236847