CI: Add validate-modfile step in drone (#69232)

* chore: test drone step

* revert changes to lint_backend_step()

* try to add validate_modifle_step

* try to run check func

* remove CGO and wire-install

* update filepath to scripts/modowners

* make drone again

* correct the filepath

* try to ignore validate-modfile step if fail

* chore: remove log that says i am a programmer

* fix: spell modfile correctly

* chore: remove unecessary comment

* fix: check go.mod instead of go.txd

scripts/drone/pipelines/lint_backend.star

@@ -9,6 +9,7 @@ load(
     "identify_runner_step",
     "lint_backend_step",
     "lint_drone_step",
+    "validate_modfile_step",
     "wire_install_step",
 )
 load(
@@ -45,6 +46,7 @@ def lint_backend_pipeline(trigger, ver_mode):
 
     test_steps = [
         lint_backend_step(),
+        validate_modfile_step(),
     ]
 
     if ver_mode == "main":