[FIX] ir_module_module: unlink uninstalled modules (#21111)

Before this revision, unlinking a module which has been uninstalled at
least once would raise an Exception because base_module_uninstall
contains a field model_id which is required. The unlink method of
ir_module_module would try to set this field to NULL which is of course
a constraint violation.

This is fixed by manually unlinking the respective base_module_uninstall
records before the unlinking of the ir_module_module record itself

Fixes #20720

DO NOT FORWARD-PORT

odoo/addons/base/module/module.py

@@ -305,6 +305,14 @@ class Module(models.Model):
             if module.state in ('installed', 'to upgrade', 'to remove', 'to install'):
                 raise UserError(_('You try to remove a module that is installed or will be installed'))
         self.clear_caches()
+        # Installing a module creates entries in base.module.uninstall, during
+        # the unlink process of ir.module.module we try to update the
+        # base.module.uninstall table's module_id to null, which violates a
+        # non-null constraint, effectively raising an Exception.
+        # V11-only !!DO NOT FORWARD-PORT!!
+        self.env['base.module.uninstall'].search(
+            [('module_id', 'in', self.ids)]
+        ).unlink()
         return super(Module, self).unlink()
 
     @staticmethod