Fix store auth API Client key

[dmerand]

What

Update shopify store auth to use the correct API client ID.

Also update store auth/session test fixtures to derive their client ID and session keys from the shared constant instead of hardcoding the old value.

Why

The store auth flow was pointed at the wrong app, which made PKCE auth behave incorrectly.

The tests also hardcoded the previous client ID, so once the constant changed they started asserting against the wrong session bucket.

Testing

To test manually:

1. Run shopify store auth --store <store> --scopes read_products
2. Complete the PKCE flow
3. Confirm the consent screen is for the expected app
4. Confirm auth succeeds

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[dmerand]

• Store auth/execute UX improvements #7151
• Adjust store auth warning for non-canonical store domain #7150
• Canonicalize scopes for store auth #7149
• Fix store auth API Client key #7148 👈 (View in Graphite)
• main

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[github-actions]

We detected some changes at packages/*/src and there are no updates in the .changeset.
If the changes are user-facing, run pnpm changeset add to track your changes and include them in the next release CHANGELOG.

Caution

DO NOT create changesets for features which you do not wish to be included in the public changelog of the next CLI release.

[Copilot]

Pull request overview

Fixes the Store auth flow configuration by updating the OAuth app client id used by the CLI’s store authentication and token refresh logic.

Changes:

• Updated STORE_AUTH_APP_CLIENT_ID to the correct API client id for Store auth flows.

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