feat(backupdr): Add data resource samples

[kushallunkad-google]

Description

Fixes #

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

Checklist

Readiness

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

Style

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

Testing

• I have performed tests described in the Contributing guide:

  • Tests pass: terraform apply
  • Lint pass: terraform fmt check

Intended location

• Yes, this sample will be (or already is) included on cloud.google.com
  Location(s):

• 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

[glasnt]

Hello @kushallunkad-google. There's a number of issues with this PR that need to be addressed.
Do you have an internal bug I can check to confirm the intent with this sample, and share internal resources to help resolve the issues? Normally we ask this is listed in the PR description, but it appears to be missing.

[glasnt]

Per internal comms, this PR may no longer be required. Will wait on author to close.