feat(networksecurity): Add examples for creating consumer and producer intercept

[duvni]

Description

Fixes #405705397

Adding samples for creating a simple consumer and producer setup of Network Security In-band Integration using the intercept Terraform resources.

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): https://cloud.google.com/network-security-integration/docs/in-band/in-band-integration-overview

• 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]

Here is the summary of changes.

You are about to add 14 region tags.

• network_security/intercept/basic/consumer/main.tf:17, tag networksecurity_intercept_basic_consumer
• network_security/intercept/basic/consumer/main.tf:18, tag networksecurity_intercept_create_producer_network_tf
• network_security/intercept/basic/consumer/main.tf:26, tag networksecurity_intercept_create_consumer_network_tf
• network_security/intercept/basic/consumer/main.tf:34, tag networksecurity_intercept_create_producer_deployment_group_tf
• network_security/intercept/basic/consumer/main.tf:43, tag networksecurity_intercept_create_endpoint_group_tf
• network_security/intercept/basic/consumer/main.tf:52, tag networksecurity_intercept_create_endpoint_group_association_tf
• network_security/intercept/basic/producer/main.tf:17, tag networksecurity_intercept_basic_producer
• network_security/intercept/basic/producer/main.tf:18, tag networksecurity_intercept_create_network_tf
• network_security/intercept/basic/producer/main.tf:26, tag networksecurity_intercept_create_subnetwork_tf
• network_security/intercept/basic/producer/main.tf:36, tag networksecurity_intercept_create_health_check_tf
• network_security/intercept/basic/producer/main.tf:47, tag networksecurity_intercept_create_backend_service_tf
• network_security/intercept/basic/producer/main.tf:58, tag networksecurity_intercept_create_forwarding_rule_tf
• network_security/intercept/basic/producer/main.tf:72, tag networksecurity_intercept_create_deployment_group_tf
• network_security/intercept/basic/producer/main.tf:81, tag networksecurity_intercept_create_deployment_tf

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