feat(bigquery): Add example for creating a none reservation assignment

[ccarpentiere]

Description

Fixes #332611431

Note: If you are not associated with Google, open an issue for discussion before submitting a pull request.

Checklist

Readiness

• [X] Yes, merge this PR after it is approved
• [ ] No, don't merge this PR after it is approved

Style

• [X] My sample follows the rules described for Terraform in the Effective Samples style guide
• [X] My sample follows the other requirements and best practices in the Contributing guide

Testing

• [X] I have performed tests described in the Contributing guide:

  • [X] Tests pass: terraform apply
  • [X] Lint pass: terraform fmt check

Intended location

• [X] Yes, this sample will be (or already is) included on cloud.google.com Location(s): https://cloud.google.com/bigquery/docs/reservations-assignments#assign-project-to-none

• [ ] No, this sample won't be included on cloud.google.com Reason:

API enablement

• [ ] If the sample needs an API enabled to pass testing, I have added the service to the Test setup file

Review

• [ ] If this sample adds a new directory, I have added codeowners to the CODEOWNERS file

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [bigquery/bigquery_create_reservation_none/main.tf:17](https://github.com/ccarpentiere/terraform-docs-samples/blob/5f65b0e5dc571e1038b37428b2be601127b559b0/bigquery/bigquery_create_reservation_none/main.tf#L17), tag `bigquery_create_reservation_assignment_none`

---

This comment is generated by snippet-bot. If you find problems with this result, please file an issue at: https://github.com/googleapis/repo-automation-bots/issues. To update this comment, add snippet-bot:force-run label or use the checkbox below:

• [ ] Refresh this comment

[ccarpentiere]

/gcbrun