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.

.drone.yml

@@ -100,7 +100,7 @@ steps:
   - name: checks-backend
     image: golang:1.19
     commands:
-      - make checks-backend
+      - make --always-make checks-backend # ensure the 'go-licenses' make target runs
     depends_on: [deps-backend]
     volumes:
       - name: deps
@@ -112,16 +112,11 @@ steps:
       - make test-frontend
     depends_on: [lint-frontend]
 
-  - name: generate-frontend
-    image: golang:1.19
-    commands:
-      - make generate-frontend
-
   - name: build-frontend
     image: node:18
     commands:
       - make frontend
-    depends_on: [deps-frontend, generate-frontend]
+    depends_on: [deps-frontend]
 
   - name: build-backend-no-gcc
     image: golang:1.18 # this step is kept as the lowest version of golang that we support
@@ -549,16 +544,11 @@ steps:
     commands:
       - make deps-frontend
 
-  - name: generate-frontend
-    image: golang:1.18
-    commands:
-      - make generate-frontend
-
   - name: build-frontend
     image: node:18
     commands:
       - make frontend
-    depends_on: [deps-frontend, generate-frontend]
+    depends_on: [deps-frontend]
 
   - name: deps-backend
     image: golang:1.18