Update flakey build output test (#51411)

These are sorted by duration which can be arbitrary and aren't
guaranteed to not be collapsed so this updates to only check for the
ones we know will always be visible.

x-ref:
https://github.com/vercel/next.js/actions/runs/5289693006/jobs/9573031740?pr=51406#step:26:275

test/integration/build-output/test/index.test.js

@@ -171,11 +171,6 @@ describe('Build Output', () => {
           expect.stringMatching(/\/2000\/10 \(\d+ ms\)$/),
           expect.stringMatching(/\/10\/1000 \(\d+ ms\)$/),
           expect.stringMatching(/\/300\/10 \(\d+ ms\)$/),
-          // kept in original order
-          expect.stringMatching(/\/5\/5/),
-          expect.stringMatching(/\/25\/25/),
-          expect.stringMatching(/\/20\/20/),
-          expect.stringMatching(/\/10\/10/),
           // max of 7 preview paths
           ' [+2 more paths]',
         ]) {