[FIX] subscription_oca: product-subscription_template company issues

Make company required on subscription_template.

Make subcription_template_id a company-dependent field
on product_template.

subscription_oca/migrations/14.0.2.0.0/pre-migrate.py

@@ -0,0 +1,13 @@
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    openupgrade.copy_columns(
+        env.cr,
+        {
+            "product_template": [
+                ("subscription_template_id", "old_subscription_template_id", None)
+            ]
+        },
+    )