test: add "clock" to the metadata for dashboard traceability (#31370)

tests/library/playwright.config.ts

@@ -134,6 +134,7 @@ for (const browserName of browserNames) {
         mode,
         video: !!video,
         trace: !!trace,
+        clock: 'clock-' + (process.env.PW_CLOCK || 'default'),
       },
     });
   }

tests/playwright-test/playwright.config.ts

@@ -49,4 +49,7 @@ export default defineConfig({
     },
   ],
   reporter: reporters(),
+  metadata: {
+    clock: 'clock-' + (process.env.PW_CLOCK || 'default'),
+  },
 });