RFR: 8367150: Add a header line to improve VMErrorCallback printing

[Stefan Karlsson]

On Tue, 9 Sep 2025 06:26:43 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Currently all the registered VMErrorCallback are printed one after another in the error report with only a newline separating them. It makes harder to both quickly find the section, or differentiate the where one starts and another begins in the case of multiple callbacks. I propose we add a simple header line before each callback.
> 
> 
> VMErrorCallback 1:
> [ First callback's print ]
> VMErrorCallback 2:
> [ Second callback's print ]

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27160#pullrequestreview-3201122460