Enrich email body when mail address of user gets changed

[haerter-tss]

Situation:

It is possible for admins to change the email address of SecHub users. They will recieve an email, but all it currently says is:

Subject: SecHub account email address changed

A SecHub administrator has changed your email address and it will not be used any longer for SecHub.

In case you do not receive a follow up notification to the new email address, please inform your SecHub administrator!

Wanted:

The email should say for which user the mail address was changed, and what the new email address is.

Example:

Subject: SecHub email address of $SECHUB_USER changed

A SecHub administrator has changed the email address of $SECHUB_USER from $OLD_EMAIL_ADDRESS to $NEW_EMAIL_ADDRESS.

In case you do not receive a follow up notification to the new email address, please inform your SecHub administrator!