Hook go-licenses into tidy again (#21353)

Running it as part of the build is really unnecessary because we have a
valid output file in the repo and assuming go dependencies do not change
unless go.mod also changes, tidy really is the best target to run the
license generation after.

Also, regenerate the file as I missed to do so during the chroma update,
and mark all json files in assets as generated.

Makefile

@@ -406,6 +406,7 @@ unit-test-coverage:
 tidy:
 	$(eval MIN_GO_VERSION := $(shell grep -Eo '^go\s+[0-9]+\.[0-9.]+' go.mod | cut -d' ' -f2))
 	$(GO) mod tidy -compat=$(MIN_GO_VERSION)
+	@$(MAKE) --no-print-directory $(GO_LICENSE_FILE)
 
 vendor: go.mod go.sum
 	$(GO) mod vendor
@@ -413,7 +414,7 @@ vendor: go.mod go.sum
 
 .PHONY: tidy-check
 tidy-check: tidy
-	@diff=$$(git diff go.mod go.sum); \
+	@diff=$$(git diff go.mod go.sum $(GO_LICENSE_FILE)); \
 	if [ -n "$$diff" ]; then \
 		echo "Please run 'make tidy' and commit the result:"; \
 		echo "$${diff}"; \
@@ -709,17 +710,14 @@ install: $(wildcard *.go)
 build: frontend backend
 
 .PHONY: frontend
-frontend: generate-frontend $(WEBPACK_DEST)
+frontend: $(WEBPACK_DEST)
 
 .PHONY: backend
 backend: go-check generate-backend $(EXECUTABLE)
 
 # We generate the backend before the frontend in case we in future we want to generate things in the frontend from generated files in backend
 .PHONY: generate
-generate: generate-backend generate-frontend
-
-.PHONY: generate-frontend
-generate-frontend: $(GO_LICENSE_FILE)
+generate: generate-backend
 
 .PHONY: generate-backend
 generate-backend: $(TAGS_PREREQ) generate-go