🗃️ Squash and optimize forms app migrations

All operations of the forms app were squashed into a single migration
using manage.py squashmigrations.

Afterwards, the optimization was done manually:

* re-ordered CreateModel operations
* moved AddField operations into the CreateModel operations
* removed fields from CreateModel for which a RemoveField operation
  was present
* incorporated AlterField into CreateModel operations
* Removed the operations to patch formio component configurations,
  those are not needed on fresh installations

src/openforms/config/tests/test_migrations.py

@@ -3,7 +3,7 @@
 
 class EnableNewBuilderMigrationTests(TestMigrations):
     app = "config"
-    migrate_from = "0053_v230_to_v250"
+    migrate_from = "0001_initial_to_v250"
     migrate_to = "0054_enable_new_builder"
 
     def setUpBeforeMigration(self, apps):