[REF] fetchmail: clean and remove unnecessary code about mail.mail

Purpose: small cleaning of code linked to mail.mail model in order to
avoid unnecessary overrides

  * create mail: default_fetchmail_server_id in context should be sufficient
    as it is the base mechanism of default_get;
  * write: unused in codebase. Anyway we should not write on mail and if it
    is the case giving fetchmail_server_id directly should be the correct
    way of doing it;

In case of a clean_context use we might loose default_fetchmail_server_id
key. It is used notably for tracking message generation. In that case
this information could be lost. However the whole concept of propagating
a fetrchmail_server-id from incoming mail server to outgoing emails (as
mail.mail is used only for sending email) is strange and does not require
so much specific code.

Sub-part of task 1853147 (pre-cleaning before implementing mail gateway
improvements)
Linked to PR #32974

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