Create Storybook's settings directory in the Playwright image - #5629

Fixes

Unblocks #5539.

Description

Storybook 8.6 writes a global settings file to $HOME/.storybook/settings.json. The Playwright container runs as the host user id with no matching home directory, so $HOME resolves to / and the write fails:

SB_CORE-SERVER_0001 (SavingGlobalSettingsFileError): Unable to save global settings file to /.storybook/settings.json
Reason: Error: EACCES: permission denied, mkdir '/.storybook'

That aborts the Storybook server before Playwright can connect, which is why the Storybook job fails on #5539. This pre-creates the directory with open permissions, the same way Dockerfile.playwright already handles the corepack and dlx cache folders.

Storybook 8.6 also prompts on first start whether to send anonymous crash reports, unless telemetry is disabled or CI is set in the environment. Neither is true inside the Playwright container, and the prompt blocks the server until Playwright's five-minute wait expires. The second commit disables telemetry in .storybook/main.ts, which skips the prompt.

Verified locally by running pnpm test:storybook on the #5539 branch with both changes: all 317 Storybook tests pass. With only the directory change, the run hangs on the prompt.

Testing Instructions

After merge, tick the rebase checkbox for #5539 in #255. The "Run Playwright tests (storybook)" job should pass.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

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