Convert 19 straightforward components that use the library's standard
patterns (rules.standard, rules.linterRules, rules.mrOnly, job.new).

Components: yamllint, editorconfig-check, hclfmt, shfmt, jsonnetfmt,
jsonnetlint, jsonfmt, promlint, yamlfmt, rubocop, terraform-format,
terraform-validate, tflint, terraform-docs, helm-lint, helm-unittest,
gitleaks, gitlint, conftest.

AI-assisted: GitLab Duo Agentic Chat (Claude Opus 4.6)

Convert simple linter, terraform, and helm components to Jsonnet

See merge request !1378

fix: yamllint.yml should use docker_hub_host input so downstream repos can set that variable to CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX and avoid Docker Hub rate limiting

fix: yamllint.yml should use docker_hub_host input so downstream repos can set that variable to CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX and avoid Docker Hub rate limiting

See merge request !1396

## [3.14.4](https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/compare/...) (2026-04-01)

### Fixes

* forgot to add it to input specs ([a0920d8c](a0920d8c))
* forgot to add it to input specs ([426d04e5](426d04e5))
* yamllint.yml should use docker_hub_host input so downstream repos can set that variable to CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX and avoid Docker Hub rate limiting ([7e94b6c9](7e94b6c9))

### Others

* convert simple linter, terraform, and helm components to Jsonnet ([4b0154f5](4b0154f5))