RFR: 8432: Better exception handling for Email Trigger failure

[duke]

On Mon, 8 Dec 2025 11:31:36 GMT, Aymane Harmaz <aharmaz at openjdk.org> wrote:

> This PR : 
> - Restructures the exception message displayed when the email send trigger fails, to show the root cause of the issue at the top before the trigger message
> - Increases the initial height of alert dialog for a better visibility
> 
> Alert dialog after the change : 
> 
> <img width="609" height="348" alt="Screenshot 2025-12-08 at 12 23 02" src="https://github.com/user-attachments/assets/0f933b11-4b46-44e3-89fa-377633ff7f8c" />

@aymane-harmaz 
Your change (at version daedb26c5d1025fb506421f35fa644305b01c973) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jmc/pull/692#issuecomment-3672189710