Enhancement: Allow excluding mail attachments by name (#4691)

* Adds new filtering to exclude attachments from processing

* Frontend use include / exclude mail rule filename filters

---------

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/paperless_mail/migrations/0023_remove_mailrule_filter_attachment_filename_and_more.py

@@ -0,0 +1,29 @@
+# Generated by Django 4.2.7 on 2023-11-28 17:47
+
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("paperless_mail", "0022_mailrule_assign_owner_from_rule_and_more"),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name="mailrule",
+            old_name="filter_attachment_filename",
+            new_name="filter_attachment_filename_include",
+        ),
+        migrations.AddField(
+            model_name="mailrule",
+            name="filter_attachment_filename_exclude",
+            field=models.CharField(
+                blank=True,
+                help_text="Do not consume documents which entirely match this filename if specified. Wildcards such as *.pdf or *invoice* are allowed. Case insensitive.",
+                max_length=256,
+                null=True,
+                verbose_name="filter attachment filename exclusive",
+            ),
+        ),
+    ]