Move debug artifact methods into separate file

src/debug-artifacts.test.ts

@@ -0,0 +1,18 @@
+import test from "ava";
+
+import * as debugArtifacts from "./debug-artifacts";
+
+test("sanitizeArifactName", (t) => {
+  t.deepEqual(
+    debugArtifacts.sanitizeArifactName("hello-world_"),
+    "hello-world_"
+  );
+  t.deepEqual(debugArtifacts.sanitizeArifactName("hello`world`"), "helloworld");
+  t.deepEqual(debugArtifacts.sanitizeArifactName("hello===123"), "hello123");
+  t.deepEqual(
+    debugArtifacts.sanitizeArifactName("*m)a&n^y%i££n+v!a:l[i]d"),
+    "manyinvalid"
+  );
+});
+
+// TODO(angelapwen): Test uploadDebugArtifacts if toUpload is empty