RFR: 6004: Should add tenuring summary to the GC visualization

[Aymane Harmaz]

On Wed, 22 Oct 2025 15:13:32 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> Looks good Aymane! Do you also handle the case where the event is off, so that there aren't any tenuring distribution events available at all?

I have added in the latest commit checks on tenuring events, if not found, I display the following message for all kind of selections: 

<img width="1085" height="245" alt="NoTenuringEventMessage" src="https://github.com/user-attachments/assets/6397981f-d379-47aa-b05c-586df7fefa01" />

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PR Comment: https://git.openjdk.org/jmc/pull/679#issuecomment-3437478067