migrations: use go:embed instead of gobindata (#19769)

Makefile

@@ -296,15 +296,6 @@ new-migration: migration-prereqs ## Creates a new migration
 
 	@echo "When you are done writing your migration, run 'make migrations-bindata'"
 
-migrations-bindata: ## Generates bindata migrations
-	$(GO) install github.com/go-bindata/go-bindata/...@v3.1.2
-
-	@echo Generating bindata for migrations
-	$(GO) generate $(GOFLAGS) ./db/migrations/
-
-	@echo Generating bindata for configuration migrations
-	$(GO) generate $(GOFLAGS) ./config/migrations/
-
 filestore-mocks: ## Creates mock files.
 	$(GO) install github.com/vektra/mockery/...@v1.1.2
 	$(GOBIN)/mockery -dir shared/filestore -all -output shared/filestore/mocks -note 'Regenerate this file using `make filestore-mocks`.'