DEV: Convert min_trust_to_edit_wiki_post to groups (#24766)

This change converts the min_trust_to_edit_wiki_post site setting to edit_wiki_post_allowed_groups.

See: https://meta.discourse.org/t/283408

Hides the old setting
Adds the new site setting
Add a deprecation warning
Updates to use the new setting
Adds a migration to fill in the new setting if the old setting was changed
Adds an entry to the site_setting.keywords section
Updates tests to account for the new change
After a couple of months, we will remove the email_in_min_trust setting entirely.

Internal ref: /t/117248

db/migrate/20231207011238_fill_edit_wiki_post_allowed_groups_based_on_deprecated_settings.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class FillEditWikiPostAllowedGroupsBasedOnDeprecatedSettings < ActiveRecord::Migration[7.0]
+  def up
+    old_setting_trust_level =
+      DB.query_single(
+        "SELECT value FROM site_settings WHERE name = 'min_trust_to_edit_wiki_post' LIMIT 1",
+      ).first
+
+    if old_setting_trust_level.present?
+      edit_wiki_post_allowed_groups = "1#{old_setting_trust_level}"
+
+      DB.exec(
+        "INSERT INTO site_settings(name, value, data_type, created_at, updated_at)
+        VALUES('edit_wiki_post_allowed_groups', :setting, '20', NOW(), NOW())",
+        setting: edit_wiki_post_allowed_groups,
+      )
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end