[FIX] stock: remove existing demo data on reinstall

Previous to this rev.:
    *Install stock w/ demo data
    *Uninstall stock
    *Reinstall stock

Result: Boom! Installation crashes.

Reason: The demo data installed with stock is not properly deleted after
the module is uninstalled, which causes issues/conflicts upon
reinstallation of the same demo data.

Solution: Remove any demo data of stock models upon installation if any
exist through a pre_init_hook, ideally this would be done by overriding
the unlink() of the affected models / setting some ondelete='cascade',
or even a uninstall_hook, however these solutions prove insufficient for
databases that are currently affected by the problem.

Fixes #22243

addons/stock/__init__.py

@@ -4,4 +4,16 @@
 import controllers
 import models
 import report
-import wizard
+import wizard
+
+
+from odoo import api, SUPERUSER_ID
+
+
+# TODO: Apply proper fix & remove in master
+def pre_init_hook(cr):
+    env = api.Environment(cr, SUPERUSER_ID, {})
+    env['ir.model.data'].search([
+        ('model', 'like', '%stock%'),
+        ('module', '=', 'stock')
+    ]).unlink()

addons/stock/__manifest__.py

@@ -101,4 +101,5 @@ Dashboard / Reports for Inventory Management will include:
     'installable': True,
     'application': True,
     'auto_install': False,
+    'pre_init_hook': 'pre_init_hook',
 }