feat(networksecurity): Add samples for mirroring rule creation

[duvni]

Description

Adding samples for Security Profile, Security Profile Group and Global Firewall Policy, to showcase how a mirroring rule is added.

CI tests are skipped since there are permission issues with org/folder level resources.
Local testing was performed successfully.

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

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• network_security/mirroring/basic/consumer/main.tf:45, tag networksecurity_mirroring_create_consumer_subnetwork_tf
• network_security/mirroring/basic/consumer/main.tf:79, tag networksecurity_mirroring_create_security_profile_tf
• network_security/mirroring/basic/consumer/main.tf:92, tag networksecurity_mirroring_create_security_profile_group_tf
• network_security/mirroring/basic/consumer/main.tf:101, tag networksecurity_mirroring_create_firewall_policy_tf
• network_security/mirroring/basic/consumer/main.tf:107, tag networksecurity_mirroring_create_firewall_policy_rule_tf
• network_security/mirroring/basic/consumer/main.tf:126, tag networksecurity_mirroring_create_firewall_policy_association_tf

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