[FIX] mail: fix height overflow of mentions

Due to mentions being positioned inside thread view and messaging list (when in
chat window) and those two elements having `overflow: auto`, it is necessary to
give mentions an appropriate max height to prevent overflow.

This makes it necessary to add a scrollbar to the mention list, which makes
scrolling into view of active item necessary when navigating with the keyboard.

Also removed activating item on mouse over to prevent activation of wrong items
when navigating with keyboard if the cursor is unfortunately over another item.

task-2275828

closes odoo/odoo#60930

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

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