[FIX] Resolve deprecation warnings (no-group ACL rules + misc)
Fix "Rule ... has no group" deprecation (Odoo 18) on ir.model.access rows that granted read access without a group. Replace the implicit global access with explicit base.group_user/group_portal/group_public rows to preserve the original "readable by everyone" semantics (generic_tag, generic_condition; portal read is required, proven by test_36_condition_partner_has_only_contacts__access_portal_user). Test-helper models (generic_tag_test, test_generic_mixin) get base.group_user.
Also fix secondary warnings:
- kanban-box -> card template (Odoo 18) in test_generic_mixin view
- deprecated 'Filter' condition type -> simple_field in demo data
- add missing _description on test.contact.mixin
- odoo.tests.common.Form -> odoo.tests.Form
- test_crypto_settings.tearDownClass called setUpClass (leaked patchers)
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com