[FIX] crm,mass_mailing: remove some utm.mixin, clean mass_mailing model

- Remove _inherit = ['utm.mixin'] on some reports and models. It make no sense
  to set campaign_id, source_id or medium_id on reports according to the
  cookies.
- Add an inheritS on the source_id in the mass_mailing model. Naturally, the
  source_id name is the mass_mailing name.
- The medium is hardcoded as beeing 'Email', which is rather easy to understand
- Remove the 'Tracking' tab on the mass_mailing view.

We do not want to set the medium,campaign or the source automatically
from the cookies on reports, or on mass_mailing creation.

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