[FIX] web: prevent traceback when pressing TAB in color_picker widget

The color_picker widget, that can be seen for example in the track form
view for event tracks, had an issue: if the user clicked on it, then
pressed TAB, a traceback was displayed.

The problem comes from the fact that the color picker widget inherits
from FieldInput, but is not a fieldinput, so many expectations made by
the FieldInput code do not hold, such as the code run when handling
navigation (by TAB and such keypress). Because of that, the code in
_onNavigationMove crashed, because it expected an input.

Since this is a bug fix, I simply disabled the navigation in that case,
so no crash happens.  Sadly, this widget has still a big issue: it
clearly does not work as most users would expect: pressing TAB or arrows
should update the selection.  But this would be a more complicated
refactoring, for a bug which is clearly not critical, therefore this
commit implements the simple and safe solution.

Also, we disable the focus outline to minimize the wrong expectation.
Seeing them kind of implied that one could update the selection with the
keyboard.

Note that the widget color_picker was moved from another addon to web/, without
any tests nor documentation.

OPW 2467369

closes odoo/odoo#67174

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