Fix flaky css test and remove unused tests deps

[huozhi]

• use check to wait for css change
• remove unused swr deps and update them to latest
• remove swr esm test in app-dir/app/ since it's already covered in app-dir/app-external/

[ijjk]

Failing test suites

Commit: c589f14

pnpm testheadless test/e2e/app-dir/app/standalone.test.ts

• output: standalone with app dir > should handle trace files correctly for route groups (nodejs only)
• output: standalone with app dir > should work correctly with output standalone

Expand output

● output: standalone with app dir › should handle trace files correctly for route groups (nodejs only)

next build failed with code/signal 1

  77 |           if (code || signal)
  78 |             reject(
> 79 |               new Error(`next build failed with code/signal ${code || signal}`)
     |               ^
  80 |             )
  81 |           else resolve()
  82 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:79:15)

● output: standalone with app dir › should work correctly with output standalone

next build failed with code/signal 1

  77 |           if (code || signal)
  78 |             reject(
> 79 |               new Error(`next build failed with code/signal ${code || signal}`)
     |               ^
  80 |             )
  81 |           else resolve()
  82 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:79:15)

Read more about building and testing Next.js in contributing.md.

pnpm testheadless test/e2e/app-dir/app-css/index.test.ts

• app dir css > Suspensey CSS > should timeout if the resource takes too long

Expand output

● app dir css › Suspensey CSS › should timeout if the resource takes too long

TIMED OUT: /background = rgb\(0, 0, 0\)/

background = rgba(0, 0, 0, 0)

undefined

  569 |
  570 |   if (hardError) {
> 571 |     throw new Error('TIMED OUT: ' + regex + '\n\n' + content + '\n\n' + lastErr)
      |           ^
  572 |   }
  573 |   return false
  574 | }

  at check (lib/next-test-utils.js:571:11)
  at Object.<anonymous> (e2e/app-dir/app-css/index.test.ts:517:11)

Read more about building and testing Next.js in contributing.md.