[IMP] web_editor: optimize selector functions for snippetOptions

Because of cross-browser compatibility concerns, jQuery's selector
engine makes using :has selector relatively slow. This is usually
acceptable, but in the case of snippet options, some options also need
to use :has in their data-target selector, and nested :has selectors'
performance degrade exponentially with the level of nesting.

Additionaly, jQuery evaluates complex selectors right-to-left, which
makes the :not operator quite inefficient.

Because of that, this commit removes :has and :not from the conditions
that were added at the end of the data-selector, and speeds up the
selector by a factor of ~15-40

Lastly, the addDropSelector options was actually unused, and a leftover
from the editor revert, as such it has been removed.

closes odoo/odoo#50073

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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