This change adds the `terraform-docs` check to the default `terraform`
template.

Also included is a change to only run `terraform-docs` when a
`.terraform-docs.yml` file is present to ensure that we won't run the
check when there is no expectation to run `terraform-docs`.

This reduces the number of additional includes required in each
terraform module project to have the standard checks.

feat: Include terraform-docs component by default in terraform

See merge request !1131

## [2.92.0](https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/compare/...) (2025-09-09)

### Features

* Include terraform-docs component by default in terraform ([c1294ca1](c1294ca1))