test: move Vitest configs under test

test/vitest/vitest.extension-messaging-paths.mjs

@@ -0,0 +1,20 @@
+import { bundledPluginRoot } from "../../scripts/lib/bundled-plugin-paths.mjs";
+
+export const messagingExtensionIds = [
+  "bluebubbles",
+  "googlechat",
+  "mattermost",
+  "nextcloud-talk",
+  "nostr",
+  "qqbot",
+  "synology-chat",
+  "tlon",
+  "twitch",
+  "voice-call",
+];
+
+export const messagingExtensionTestRoots = messagingExtensionIds.map((id) => bundledPluginRoot(id));
+
+export function isMessagingExtensionRoot(root) {
+  return messagingExtensionTestRoots.includes(root);
+}