Chore: Cleanup Makefile (#53037)

Remove redundant reference to deleted folder pkg/api/docs/definitions

Makefile

@@ -12,7 +12,6 @@ include .bingo/Variables.mk
 GO = go
 GO_FILES ?= ./pkg/...
 SH_FILES ?= $(shell find ./scripts -name *.sh)
-API_DEFINITION_FILES = $(shell find ./pkg/api/docs/definitions -name '*.go' -print)
 GO_BUILD_FLAGS += $(if $(GO_BUILD_DEV),-dev)
 GO_BUILD_FLAGS += $(if $(GO_BUILD_TAGS),-build-tags=$(GO_BUILD_TAGS))
 
@@ -43,7 +42,7 @@ $(MERGED_SPEC_TARGET): $(SPEC_TARGET) $(NGALERT_SPEC_TARGET) $(SWAGGER) ## Merge
 	# known conflicts DsPermissionType, AddApiKeyCommand, Json, Duration (identical models referenced by both specs)
 	$(SWAGGER) mixin $(SPEC_TARGET) $(NGALERT_SPEC_TARGET) --ignore-conflicts -o $(MERGED_SPEC_TARGET)
 
---swagger-api-spec: $(API_DEFINITION_FILES) $(SWAGGER) ## Generate API Swagger specification
+--swagger-api-spec: $(SWAGGER) ## Generate API Swagger specification
 	SWAGGER_GENERATE_EXTENSION=false $(SWAGGER) generate spec -m -w pkg/server -o public/api-spec.json \
 	-x "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions" \
 	-x "github.com/prometheus/alertmanager" \