[REF] calendar: clean strange email send code

Purpose: clean mail.mail creation code and use standard mail creation or
template send_mail method.

In calendar there was strange code creating an email based on a template
then updating some values on its mail.message record created through
inherits. It seems simpler to correctly set some specific email arguments
to MailTemplate.send_mail() method and avoid this kind of code construction.

Related task ID 1965040
PR #32459

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