Allow passing an array of auth decoders to createGraphQLHandler

[Tobbe]

This was supposed to have been included in #7349 but I missed to do that.

This PR also adds tests for the standard one-auth-decoder scenario that has always been missing tests. Plus adds test for the new array-of-auth-decoders scenario.

[replay-io]

16 replays were recorded for f7d709c.

0 Failed

16 Passed

requireAuth graphql checks

    ```
    locator.waitFor: Target closed
    =========================== logs ===========================
    waiting for locator('.rw-form-error-title').locator('text=You don\'t have permission to do that') to be visible
    ============================================================
    ```
  </ol>
</details>
<li><a href=https://app.replay.io/recording/3d46e354-004c-4d4a-9f1d-1fa032b81b9b>useAuth hook, auth redirects checks</a></li>
<li><a href=https://app.replay.io/recording/e9f48d16-9b68-4421-b97d-9d140e7d8088>Check that <meta> tags are rendering the correct dynamic data</a></li>
<li><a href=https://app.replay.io/recording/e1c45d0c-9883-47de-b2ff-439873692215>Check that a specific blog post is prerendered</a></li>
<li><a href=https://app.replay.io/recording/fae2fedf-30cf-4371-b3e7-cb221f49fecb>Check that about is prerendered</a></li>
<li><a href=https://app.replay.io/recording/30fb8bc8-2277-4f99-bfc0-15b02bff14e2>Check that homepage is prerendered</a></li>
<li><a href=https://app.replay.io/recording/012ef5d8-4a4a-429c-9712-89c4f9ec154e>Check that you can navigate from home page to specific blog post</a></li>
<li><a href=https://app.replay.io/recording/cc290790-d98d-4514-92c9-4d85bfad5f1d>Waterfall prerendering (nested cells)</a></li>
<li><a href=https://app.replay.io/recording/0a37f23a-627a-468c-9b95-b119ccd96376>RBAC: Admin user should be able to delete contacts</a></li>
<li><a href=https://app.replay.io/recording/3d2fd2dd-0678-4d0d-b613-6f3d039bd27a>RBAC: Should not be able to delete contact as non-admin user</a></li>
<li><a href=https://app.replay.io/recording/ec4492f9-2cbc-4ee4-a542-a9c6ea0df8e9>Smoke test with dev server</a></li>
<li><a href=https://app.replay.io/recording/62c26cf0-d231-4c04-b89c-6d817c02015b>Smoke test with rw serve</a></li>
<li><a href=https://app.replay.io/recording/8325f770-b783-4765-b81b-2c2f1590837d>Loads Cell mocks when Cell is nested in another story</a></li>
<li><a href=https://app.replay.io/recording/ec757549-916a-41b6-b6f0-1536006e59a9>Loads Cell Stories</a></li>
<li><a href=https://app.replay.io/recording/6d23a4d3-5d9d-4a20-abe6-8b55e6f1a763>Loads MDX Stories</a></li>
<li><a href=https://app.replay.io/recording/1ae51d3e-084e-428f-9add-9d005d13e9b3>Mocks current user, and updates UI while dev server is running</a></li>

View test run on Replay ↗︎