[REM] hr: remove user auto subscription on its employee and kanban follow CTA

HR employee model automatically adds the employee's user as follower of
its own employee profile. It has been done at 8ab3e5d2a15cb334924bea1efe69cef73e744753 probably
when working on gamification and twitter-like employee profile. In that
use case adding the employee's user as follower was required to be able
to discuss on the employee form view. It is also a requirement to be sure
he receives news about received badges.

Since then however employee profile has been set as private and internal.
It is used only for HR purpose which is coherent with the model and the
business flow of various HR modules. Moreover it has never been really used
as intended in gamification or as a twitter-like profile. It seems therefore
not necessary to automatically add followers to this record.

If required, any message_post can add the employee's user in the recipients
if its attention is required on some message. It required only to set the
target users's partner in the partner_ids parameter of message_post that
is propagated to the message creation and notification.

An override of notification process can also be removed. It seems people
wanted to add the user to its profile but without notifying him. Let
us remove all that crap.

Finally the CTA button to (un)follow employees directly from the kanban
view is also removed for the same reasons as state hereunder.

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