[MERGE] survey, website_slides: fix various issues

PURPOSE

Fix various issues in eLearning application after new round of testing
and bug hunt. Some surveys fixes are included as they are used a lot
in eLearning.

SPECIFICATIONS

[FIX] mail: remove channel and partner default context keys when creating
  followers
[FIX] survey: fix another crashing computed field
[FIX] survey: set email_from on certification mail template
[FIX] website_profile: fix another broken image thingy
[FIX] website_slides: make content stat button redirection match counters
[FIX] website_slides: remove unnecessary action
[FIX] website_{slides, profile}: fix display of not square user image
[FIX] website_slides: avoid admin being twice member of courses in demo data
[FIX] website_slides: still another fix of computed fields
[FIX] website_sale_slides: synchronize publish status of a channel and its
  product
[FIX] website_slides_survey: create certificates with scoring by default

See sub commits for more details.

LINKS

Task 2065425 (avatar ratio badly displayed)
Task 2067324 (counters / action on content mismatch)
Task 2067872 (eLearning internal testing)
Task 2058598 (survey internal testing)

closes odoo/odoo#36756

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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