fix(quick-10): update release_groups schema and queries for composite uniqueness

- Change UNIQUE(name) to UNIQUE(name, album_artist_credit_id) in schema
- Update UpsertReleaseGroup ON CONFLICT to match composite key
- Rename GetReleaseGroupByName to GetReleaseGroupByNameAndArtist with two params
- Regenerate sqlc code

backend/database/sql/schemas/release_groups.sql

@@ -1,13 +1,14 @@
 CREATE TABLE IF NOT EXISTS release_groups (
   id                     INTEGER PRIMARY KEY,
-  name                   TEXT NOT NULL UNIQUE,
+  name                   TEXT NOT NULL,
   cover_art_id           INTEGER,
   album_artist_credit_id INTEGER,
   year                   INTEGER,
   total_tracks           INTEGER,
   total_discs            INTEGER,
   FOREIGN KEY(cover_art_id) REFERENCES cover_art(id),
-  FOREIGN KEY(album_artist_credit_id) REFERENCES artist_credit(id)
+  FOREIGN KEY(album_artist_credit_id) REFERENCES artist_credit(id),
+  UNIQUE(name, album_artist_credit_id)
 );
 
 CREATE INDEX IF NOT EXISTS idx_release_groups_cover_art_id