[FIX] base, crm: uninstallation

Uninstallation does not cope well with `setup_models` being performed
unconditionally as those will dramatically alter registry states, and
resurrect computes which the uninstallation has disabled: rather than
try to update registry models in-place (which is rather fraught) the
uninstallation deletes the columns, tables, and `ir.*` reflection
records and only after all of that is done does it reset the registry.

This means while it does fix up the registry caches (`field_depends`
and `field_triggers`) as it goes, resetting those may cause the
recomputation of fields whose columns have been deleted, possibly
based on dependencies whose columns have also been deleted.

As such these kinds of manipulations should either be performed in
`@ondelete` methods which don't get executed during uninstallation, or
they should be gated behind an uninstallation check.

In crm the latter is necessary, as `ondelete` runs before `unlink`
actually executes, and the registry reset would run too early (and
unnecessarily).

In base, only the latter is possible as we're not in `unlink` itself,
instead `IrModelFields._prepare_update` is called *during*
uninstallation and its trailing `setup_models` causes the issue.

closes odoo/odoo#119606

Related: odoo/enterprise#40284
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>