feat: Add Yarn to renovate

mentioned in commit ff1a1531

mentioned in merge request gitlab-com/runbooks!5629 (merged)

mentioned in merge request common-ci-tasks-images!91 (merged)

mentioned in merge request gitlab-org/release-tools!2265 (merged)

mentioned in merge request slackline!154 (merged)

mentioned in merge request gitlab-com/gl-infra/gitlab-dedicated/library/byok-status-exporter!5 (merged)

mentioned in merge request cmbr!163 (merged)

mentioned in merge request pmv!253 (merged)

mentioned in merge request bigquery-loader!96 (merged)

mentioned in merge request jsonnet-tool!54 (merged)

mentioned in merge request terra-transformer!242 (merged)

mentioned in merge request asdf-gl-infra!31 (merged)

mentioned in merge request fluentd-docker!38 (merged)

mentioned in merge request es-diagnostics!15 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/common!268 (merged)

mentioned in merge request asdf-promtool!39 (merged)

mentioned in merge request gitlab-com/gl-infra/gitlab-dedicated/library/terraform/cloudwatch_log_export!2 (merged)

mentioned in merge request gitlab-com/gl-infra/platform/runway/runwayctl!2 (merged)

mentioned in merge request gcp-quota-exporter!2 (merged)

mentioned in merge request es-diagnostics!18 (closed)

mentioned in merge request es-diagnostics!21