Cloudwatch: Remove core imports from infra/log (#81543)

* Cloudwatch: use logging from plugin-sdk-go instead of infra/log
* Add a link to the TODO issue for moving `instrumentContext`

pkg/tsdb/cloudwatch/utils/utils.go

@@ -1,3 +1,13 @@
 package utils
 
+import "github.com/go-stack/stack"
+
 func Pointer[T any](arg T) *T { return &arg }
+
+// Stack is copied from grafana/pkg/infra/log
+// TODO: maybe this should live in grafana-plugin-sdk-go?
+func Stack(skip int) string {
+	call := stack.Caller(skip)
+	s := stack.Trace().TrimBelow(call).TrimRuntime()
+	return s.String()
+}