Generate go-licenses during tidy again (#21108)

We can not have the `frontend` target depend on golang because of they
way drone is set up. Move the `go-licenses` generation back into `tidy`
where it will now also be checked for consistency during `tidy-check`.

(I assume all `main` branch builds should currently fail [like
this](https://drone.gitea.io/go-gitea/gitea/60244/1/11)).

The reasony why it shouldn't be treated the same as for example `go
generate` is because output files are checked in. tidy is imho the
optimal target to run this after.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

.drone.yml

@@ -102,11 +102,16 @@ 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: [test-frontend]
+    depends_on: [deps-frontend, generate-frontend]
 
   - name: build-backend-no-gcc
     image: golang:1.18 # this step is kept as the lowest version of golang that we support
@@ -529,16 +534,21 @@ services:
 
 steps:
   - name: deps-frontend
-    image: node:16
+    image: node:18
     pull: always
     commands:
       - make deps-frontend
 
+  - name: generate-frontend
+    image: golang:1.18
+    commands:
+      - make generate-frontend
+
   - name: build-frontend
-    image: node:16
+    image: node:18
     commands:
       - make frontend
-    depends_on: [deps-frontend]
+    depends_on: [deps-frontend, generate-frontend]
 
   - name: deps-backend
     image: golang:1.18