feat: dedicated: assign reviewers by username

mentioned in merge request gitlab-com/runbooks!4964 (merged)

mentioned in merge request pmv!129 (merged)

mentioned in merge request asdf-gl-infra!14 (merged)

mentioned in merge request third-party-container-images!11 (merged)

mentioned in merge request common-template-copier!53 (merged)

mentioned in merge request fluentd-docker!18 (closed)

mentioned in merge request woodhouse!195 (merged)

mentioned in merge request es-diagnostics!11 (closed)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/common!184 (merged)

mentioned in merge request slackline!95 (merged)

mentioned in merge request common-ci-tasks-images!12 (merged)

mentioned in merge request !205 (merged)

mentioned in merge request terra-transformer!111 (merged)

mentioned in merge request cmbr!96 (merged)

mentioned in merge request gitlab-org/release-tools!1992 (merged)

mentioned in merge request fluentd-docker!22 (closed)

mentioned in merge request es-diagnostics!12 (closed)

mentioned in merge request fluentd-docker!27 (merged)

mentioned in merge request es-diagnostics!15

mentioned in merge request bigquery-loader!62 (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