[REF] mail: chatter topbar styles

The Chatter's topbar (containing the buttons like 'Send Message', 'Log
Note') was difficult to deal with: specially the positioning of its
content (a float into another float...).

So, this commit refactors the topbar's layout using Flexbox. It allows
to simplify and reduce the amount of (S)CSS needed to achieve the same
visual result.

In the process, the Followers (dropdown) buttons now use correctly
nested .btn-group components (as described by the Bootstrap 4
documentation) and SubTypes dropdown items use semantic html element
(<button>) instead of attaching behavior on icon element(<i>).

Finally a few Chatter's tests requested a slight adaptation (cf.
trimming element's textual content).

Task ID: 1928573

closes odoo/odoo#33823

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

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