Clean up yaml lint warnings

.gitlab/ci/build-images.gitlab-ci.yml

.gitlab/ci/global.gitlab-ci.yml

.gitlab/ci/preflight.gitlab-ci.yml

.gitlab/ci/qa.gitlab-ci.yml

.gitlab/ci/review-apps/main.gitlab-ci.yml

.gitlab/ci/rules.gitlab-ci.yml

.gitlab/ci/setup.gitlab-ci.yml

.gitlab/ci/test-metadata.gitlab-ci.yml

data/deprecations/15-10-gitaly-legacy-config.yml

data/deprecations/15-10-helm-chart-updates.yml

data/deprecations/15-11-geo-project-redownload.yml

...eprecations/15-11-runner-images-alpine-3.12-3.13-3.14.yml

data/deprecations/15-8-third-party-registries.yml

data/deprecations/16-0-CiRunner-projects-default-sort.yml

...ations/16-0-graphql-CiRunnerUpgradeStatusType-renamed.yml

data/removals/15_10/15_10-non-public-artifacts.yml

lib/gitlab/ci/templates/Terraform/Module-Base.gitlab-ci.yml