chore(cli): Enable 'next' and 'experimental' tags for rw upgrade

[Josh-Walker-GM]

Problem
We want to allow users to select the next and experimental tags when running yarn rw upgrade --tag [tag] but this is currently not allowed.

Changes

1. Add next and experimental to the allowed tags list.
2. Update the docs to reflect the updated tag options.

[replay-io]

16 replays were recorded for e8227d4.

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/f4236b1e-86e0-4110-946d-7c90afbae681>useAuth hook, auth redirects checks</a></li>
<li><a href=https://app.replay.io/recording/c2e4f55d-2471-4fb1-a52d-31d9ad6f8b79>Check that a specific blog post is prerendered</a></li>
<li><a href=https://app.replay.io/recording/3785730d-3265-4122-9d10-5760f1ba79b3>Check that about is prerendered</a></li>
<li><a href=https://app.replay.io/recording/97ca2f27-3a0e-42d1-bd8a-a815b395255e>Check that homepage is prerendered</a></li>
<li><a href=https://app.replay.io/recording/002682bb-345f-4172-a909-16be460572d1>Check that meta-tags are rendering the correct dynamic data</a></li>
<li><a href=https://app.replay.io/recording/4ba511a4-8dc6-4571-bca6-09fa5937cf36>Check that you can navigate from home page to specific blog post</a></li>
<li><a href=https://app.replay.io/recording/1135efe6-782c-4eaf-afc0-c11300c6ded9>Waterfall prerendering (nested cells)</a></li>
<li><a href=https://app.replay.io/recording/ee49d67e-0235-4248-a6a1-a2b636a11dae>RBAC: Admin user should be able to delete contacts</a></li>
<li><a href=https://app.replay.io/recording/73bb9a83-1110-460a-b01d-220863f2c8cf>RBAC: Should not be able to delete contact as non-admin user</a></li>
<li><a href=https://app.replay.io/recording/f041fb75-ba84-44f9-8aa5-5cc3eadf9d42>Smoke test with dev server</a></li>
<li><a href=https://app.replay.io/recording/5aaf82bd-22a3-4a80-b31f-00b0d1ba29e7>Smoke test with rw serve</a></li>
<li><a href=https://app.replay.io/recording/658a4dc7-9714-4a5c-ab9f-076d1a2da559>Loads Cell mocks when Cell is nested in another story</a></li>
<li><a href=https://app.replay.io/recording/daac9da6-ba19-4e30-853b-3b4882fd3058>Loads Cell Stories</a></li>
<li><a href=https://app.replay.io/recording/e399be0a-5233-4aa8-a32f-7362f222353b>Loads MDX Stories</a></li>
<li><a href=https://app.replay.io/recording/82ce1942-60f7-4630-9817-9e07d354484c>Mocks current user, and updates UI while dev server is running</a></li>

View test run on Replay ↗︎

[Josh-Walker-GM]

Reverted to simply add "next" and "experimental" to the allowed list of tags.

I don't understand why we have an "experimental" tag given that we expect users to simply use the full SEMVER version for different experimental branches/features.

[Tobbe]

I don't understand why we have an "experimental" tag given that we expect users to simply use the full SEMVER version for different experimental branches/features.

Let's discuss this on the next core team meeting before we merge this PR please 🙂

[thedavidprice]

This looks great @Josh-Walker-GM I made some copy changes. Could you do a final check/confirmation and then merge?

Looping in @jtoar if we want to cherry-pick this into v4.5-RC

[thedavidprice]

@Tobbe I'm asking to merge this before next meeting. Happy to discuss further.

[Josh-Walker-GM]

I checked again locally and things looked and worked fine. I'll enable auto-merge but this might get stuck on the flaky logger CI error for a little bit until that's resolved separately.