Add project-remote-state attribute to Workspace

[hs26gill]

Description

This PR adds a project-remote-state attribute to Workspaces. This attribute allows the workspace to share its remote state with other workspaces within the project.

Testing plan

Added unit tests: TestWorkspacesProjectRemoteState

• API documentation
• Jira

Output from tests

Including output from tests may require access to a TFE instance. Ignore this section if you have no environment to test against.

$ TFE_ADDRESS="https://example" TFE_TOKEN="example" go test ./... -v -run TestWorkspacesProjectRemoteState

[datadog-terraform-cloud-hashicorp]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[Maed223]

Looking good, just need a slight adjustment in the changelog

[jbonhag]

Thank you!! The attribute changes look good, but I think we should drop the "beta" labels since this is available in TFE, and we're not calling it beta there.

[ctrombley]

@hs26gill would you mind rebasing this PR branch on main?

[jbonhag]

I don't know how specific we need to get with the CHANGELOG entry, but it's accurate to say that this is only available on Terraform Enterprise (for now).

Looks good!

[ctrombley]

Thanks @hs26gill !

[github-actions]

Reminder to the contributor that merged this PR: if your changes have added important functionality or fixed a relevant bug, open a follow-up PR to update CHANGELOG.md with a note on your changes.