Repository: vercel/next.js
Pull request: [test] Improve fetch timeout error stack for `act`

Before:

```
    apiRequestContext.fetch: Request timed out after 30000ms
    Call log:
      - → GET http://localhost:55200/refetch-on-new-base-tree/a?_rsc=1u5ob
      -   <snip>

      225 |             // server; we pass the request to the server the immediately.
      226 |             result: (async () => {
    > 227 |               const originalResponse = await page.request.fetch(request, {
          |                                                           ^
      228 |                 maxRedirects: 0,
      229 |               })
      230 |

      at fetch (lib/router-act.ts:227:59)
      at lib/router-act.ts:245:13
      at routeHandler (lib/router-act.ts:257:7)
```

After:

```
    apiRequestContext.fetch: Request timed out after 30000ms
    Call log:
      - → GET http://localhost:61662/refetch-on-new-base-tree/a?_rsc=1u5ob
      -   <snip>

      264 |
      265 |     // Reveal the links to trigger prefetches
    > 266 |     await act(async () => {
          |           ^
      267 |       await linkALinkVisibilityToggle.click()
      268 |       await linkBLinkVisibilityToggle.click()
      269 |     }, [

      at Object.act (e2e/app-dir/segment-cache/revalidation/segment-cache-revalidation.test.ts:266:11)
```

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Changed files:
filename: test/lib/router-act.ts
patch: @@ -224,9 +224,18 @@ export function createRouterAct(
             // but it should not affect the timing of when requests reach the
             // server; we pass the request to the server the immediately.
             result: (async () => {
-              const originalResponse = await page.request.fetch(request, {
-                maxRedirects: 0,
-              })
+              let originalResponse: Playwright.APIResponse
+              try {
+                originalResponse = await page.request.fetch(request, {
+                  maxRedirects: 0,
+                })
+              } catch (fetchError) {
+                error.message =
+                  fetchError instanceof Error
+                    ? fetchError.message
+                    : String(fetchError)
+                throw error
+              }
 
               // WORKAROUND:
               // intercepting responses with 'Transfer-Encoding: chunked' (used for streaming)