Add source URL comments to "Check Go" assets

This will make it easier for the maintainers to sync fixes and improvements in either direction between the upstream
"template" assets and their installation in this repository.

Author: per1234

.github/workflows/check-go-task.yml

@@ -1,3 +1,4 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-go-task.md
 name: Check Go
 
 env:

Taskfile.yml

@@ -61,12 +61,14 @@ tasks:
     cmds:
       - poetry run pytest tests
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
   go:vet:
     desc: Check for errors in Go code
     dir: '{{default "./" .GO_MODULE_PATH}}'
     cmds:
       - go vet {{default .DEFAULT_GO_PACKAGES .GO_PACKAGES}}
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
   go:lint:
     desc: Lint Go code
     dir: '{{default "./" .GO_MODULE_PATH}}'
@@ -81,6 +83,7 @@ tasks:
           {{default "-min_confidence 0.8 -set_exit_status" .GO_LINT_FLAGS}} \
           {{default .DEFAULT_GO_PACKAGES .GO_PACKAGES}}
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
   go:format:
     desc: Format Go code
     dir: '{{default "./" .GO_MODULE_PATH}}'