feat(application integration): Add example for creating auth configs

[pay20]

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): https://cloud.google.com/application-integration/docs/configure-authentication-profiles#createAuthProfile

• [ ] 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 possible violations 😱

There is a possible violation for removing region tag in use.

• application_integration/main.tf:20, tag application_integration_edit_region(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 2 region tags.

- [application_integration/create_auth_config/main.tf:16](https://github.com/pay20/terraform-docs-samples/blob/bca188b8ac6a9645eb175b4ae98106941d6a3384/application_integration/create_auth_config/main.tf#L16), tag `application_integration_create_auth_config` - [application_integration/provision_region/main.tf:20](https://github.com/pay20/terraform-docs-samples/blob/bca188b8ac6a9645eb175b4ae98106941d6a3384/application_integration/provision_region/main.tf#L20), tag `application_integration_edit_region`

You are about to delete 1 region tag.

- [application_integration/main.tf:20](https://github.com/terraform-google-modules/terraform-docs-samples/blob/9047d26ecc737951095207ac4ab870ad993734e0/application_integration/main.tf#L20), tag `application_integration_edit_region`

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[pay20]

Created this new PR as the old one had Lint errors. This new PR also has the same error so closing this one and focussing on pr-658