all: Add acceptance tests for write-only attributes

[austinvalle]

This PR is in draft as the target code for the tests are also in draft 👍🏻

This PR contains some tests for write-only attributes, which will be available in Terraform v1.11.0, and are actively being worked on in the provider SDKs:

• Protocol + Mux: (PRs not open yet)
• SDKv2: [DRAFT] Add support for write only attributes terraform-plugin-sdk#1375
• Framework: [DRAFT] Add support for write only attributes terraform-plugin-framework#1044

---

The SDKv2 + Framework tests cover:

• Retrieving write-only values and ensuring providers are unable to send write-only data back to Terraform
  • Trying to cover the different type/attribute combinations (blocks, nested, collections, etc.)
• Performing validation and plan modification logic on write-only attributes

The Protocol (terraform-plugin-go) tests cover:

• Testing Terraform's new data rules for write-only attributes in all RPCs that have state values returned
• Testing Terraform's new data rules for write-only attributes when indicating the legacy type system (SDKv2) is used (only Plan + Apply)

Notes

• There are a couple TODOs left in the PR that are waiting on fixes either in TF core or the WIP SDKv2/Framework PRs. I wrote the test assertion in the reverse to pop an error once those bugs are fixed 👍🏻

[austinvalle]

TODO: Update with released versions once available

[austinvalle]

TODO: Update with released version once available