Bench script flakiness

[yannbf]

The bench script seems to be flake for a few months already, always with the same error:

TypeError: Cannot read properties of null (reading 'page')
    at getPreviewPage (/tmp/storybook/scripts/bench/utils.ts:39:62)
    at tasks (/tmp/storybook/scripts/bench/browse.ts:47:27)
    at async Promise.all (index 0)
    at benchAutodocs (/tmp/storybook/scripts/bench/browse.ts:57:3)
    at browse (/tmp/storybook/scripts/bench/browse.ts:24:21)
    at Object.run (/tmp/storybook/scripts/tasks/bench.ts:33:31)
    at runTask (/tmp/storybook/scripts/task.ts:318:24)
    at run (/tmp/storybook/scripts/task.ts:464:28)

Example:
https://app.circleci.com/pipelines/github/storybookjs/storybook/75960/workflows/38365993-2b84-46d2-93de-908f951d015c/jobs/655000

https://app.circleci.com/pipelines/github/storybookjs/storybook/76312/workflows/11b5826e-b6ed-476e-82a5-20fc3a7b3797/jobs/657129

https://app.circleci.com/pipelines/github/storybookjs/storybook/76370/workflows/f8f8f596-03bf-4221-ab96-f199a4003c24/jobs/657475

Probably @shilman has thoughts on this