[docs] Add warning about prefix loss when migrating

[philomory]

trafficstars

This adds a warning about the consequences of switching to the cloud block, in terms of losing prefix support, and the impact that has on CLI usage. Specifically, after switching from the remote backend to the cloud block, CLI users lose the ability to run e.g. terraform workspace select prod, and must instead run e.g. terraform workspace select my-app-prod. This has the potential to impact previously written scripts, as well, but was until now not actually noted in the migration documentation.

[hashicorp-cla]

All committers have signed the CLA.

[crw]

Thanks for this submission! I've notified the docs team for review.

[philomory]

What needs to be done to merge this?

[vercel[bot]]

Deployment failed with the following error:

The provided GitHub repository does not contain the requested branch or commit reference. Please ensure the repository is not empty.

[digital-content-events[bot]]

📄 Content Checks

Updated: Fri, 05 May 2023 23:06:11 GMT

Found 8 error(s)

docs/cli/cloud/migrating.mdx

Position	Description	Rule
1:1-1:1	Document does not have a description key in its frontmatter. Add a description key at the top of the document.	ensure-valid-frontmatter
7:7-7:66	Unexpected product-relative link: /cli/cloud/settings. Ensure that relative links are fully-qualified Developer paths: /{productSlug}/cli/cloud/settings	ensure-valid-link-format
7:274-7:320	Unexpected product-relative link: /cloud-docs/run/cli. Ensure that relative links are fully-qualified Developer paths: /{productSlug}/cloud-docs/run/cli	ensure-valid-link-format
17:25-17:122	Unexpected link to learn.hashicorp.com: https://learn.hashicorp.com/tutorials/terraform/cloud-migrate. Replace it with a relative path internal to Developer with the format: /{productSlug}/tutorials/{collectionSlug}/{tutorialSlug}.	ensure-valid-link-format
19:90-20:38	Unexpected product-relative link: /language/settings/backends. Ensure that relative links are fully-qualified Developer paths: /{productSlug}/language/settings/backends	ensure-valid-link-format
33:41-34:39	Unexpected product-relative link: /cloud-docs/workspaces/naming. Ensure that relative links are fully-qualified Developer paths: /{productSlug}/cloud-docs/workspaces/naming	ensure-valid-link-format
40:5-40:59	Unexpected product-relative link: /language/settings/backends/remote. Ensure that relative links are fully-qualified Developer paths: /{productSlug}/language/settings/backends/remote	ensure-valid-link-format
40:112-40:158	Unexpected product-relative link: /cloud-docs/run/cli. Ensure that relative links are fully-qualified Developer paths: /{productSlug}/cloud-docs/run/cli	ensure-valid-link-format

[github-actions[bot]]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions[bot]]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions. If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.