[FIX] base_import: adapt import client action

With the recent control panel refactoring, abstract actions had to be
adapted.  The base import action is actually quite
complicated, it relies on introspection and is fragile.  With this
commit, I attempt to make it work again.  The main issue is that now,
the root of the abstractaction is a div, which contains the root of the
content template, so most of the code was assuming that the $el of the
import action was the form tag, and not a parent.

Note that there are no meaningful tests for import actions, because
testing iframes are tricky.

closes odoo/odoo#29421

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