feat(securitycenter): add sample for setting custom endpoint

[hegemonic]

Description

This sample shows how to set a custom endpoint for the Security Command Center v2 API. This information is essential for Security Command Center customers who enable data residency.

Internal bugs: b/416706500, b/417048968

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): New, work-in-progress page

• 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

Note

I only added the terraform-samples-reviewers team, because none of the other existing teams are logical owners for this sample. If we need to create a new team for this sample, please let me know who should set that up and who should be on the team.

[glasnt]

Thank for creating this PR! There are a few things that need to be changed here:

• Please add an internal bug reference to the PR description for this change.
• Security Center samples need to be placed under the securitycenter folder and region tag, not security_center (snippetbot should have automatically detected this)

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• securitycenter/securitycenter_v2_endpoint_us/main.tf:17, tag securitycenter_v2_endpoint_us

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[hegemonic]

@glasnt Done! Please consider adding those requirements to the PR template and CONTRIBUTING.md (unless they're already listed, and I just missed them).

[hegemonic]

@glasnt Can you fix the CLA issue from your commit?

[glasnt]

Pending internal ping about setting up an appropriate team.