[REF] fetchmail: rename fetchmail.server type field to server_type

Purpose of this commit is to rename type column to something matching the
the real business use of the field. That way it is easier to find and grep
in the code. It also lessens potential conflicts with type build-in python
function. It also lessens conflicts when using the field in JS as type
is a build-in attribute.

Renaming type column is a long-living issue. We choose to do it at the
beginning of the v13 development to catch errors as soon as possible.

This commit is linked to task ID 1896245. It is also a subpart of community
PR #27599.

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