[IMP] crm, website_crm_partner_assign: clean the controlpanel actions

For the model 'crm.lead'

- Rename the action menu 'Send an email' by 'Send email'.
- Remove the action menu 'Mark Late Activities as Done' and
  'Mark All Activities as Done'.
- Set 'Mark as lost' menu action only for the list view.
- Remove the action menu 'Assign salesman of assigned partner'.
- Rename the action menu 'Forward to Partner' by 'Forward to partner'
  and set it for both form and list view.

For the model 'res.partner', remove the actions menu 'Meetings'.

Linked to task 1984526
Related to PR #33720