fix: add non-concurrent index creation migrations (#579)

* get rid of concurrent

* add migrations for bid auction_id index

Author: anihamde

auction-server/migrations/20250726182247_auction_creation_time_idx.up.sql

@@ -1,2 +1 @@
--- sqlx-no-transaction
-CREATE INDEX CONCURRENTLY auction_creation_time_idx ON auction (creation_time);
+CREATE INDEX auction_creation_time_idx ON auction (creation_time);

auction-server/migrations/20250730221458_idx_bid_auction_id.down.sql

@@ -0,0 +1 @@
+DROP INDEX IF EXISTS idx_bid_auction_id;

auction-server/migrations/20250730221458_idx_bid_auction_id.up.sql

@@ -0,0 +1 @@
+CREATE INDEX idx_bid_auction_id ON bid (auction_id);