MM-41191: Apply upload_sessions incorrect index fix (#19383)

https://mattermost.atlassian.net/browse/MM-41191

```release-note
NONE
```

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

db/migrations/postgres/000075_alter_upload_sessions_index.down.sql

@@ -0,0 +1,19 @@
+DO $$
+<<alter_index>>
+DECLARE
+    column_name text;
+BEGIN
+    select array_to_string(array_agg(a.attname), ', ') as column_name INTO column_name
+    from
+        pg_index ix,
+        pg_attribute a
+    where
+        ix.indexrelid='idx_uploadsessions_user_id'::regclass
+        and a.attrelid = ix.indrelid
+        and a.attnum = ANY(ix.indkey);
+
+    IF COALESCE (column_name, '') = text('userid') THEN
+        DROP INDEX IF EXISTS idx_uploadsessions_user_id;
+        CREATE INDEX IF NOT EXISTS idx_uploadsessions_user_id on uploadsessions(type);
+    END IF;
+END alter_index $$;

db/migrations/postgres/000075_alter_upload_sessions_index.up.sql

@@ -0,0 +1,19 @@
+DO $$
+<<alter_index>>
+DECLARE
+    column_name text;
+BEGIN
+    select array_to_string(array_agg(a.attname), ', ') as column_name INTO column_name
+    from
+        pg_index ix,
+        pg_attribute a
+    where
+        ix.indexrelid='idx_uploadsessions_user_id'::regclass
+        and a.attrelid = ix.indrelid
+        and a.attnum = ANY(ix.indkey);
+
+    IF COALESCE (column_name, '') = text('type') THEN
+        DROP INDEX IF EXISTS idx_uploadsessions_user_id;
+        CREATE INDEX IF NOT EXISTS idx_uploadsessions_user_id on uploadsessions(userid);
+    END IF;
+END alter_index $$;