Rename the Agent on the GitLab UI

...avascripts/clusters_list/components/agent_empty_state.vue

...scripts/clusters_list/components/clusters_empty_state.vue

...avascripts/clusters_list/components/clusters_view_all.vue

...ascripts/clusters_list/components/install_agent_modal.vue

app/assets/javascripts/clusters_list/constants.js

...nitoring/components/policy_editor/policy_alert_picker.vue

ee/app/assets/javascripts/threat_monitoring/policy_editor.js

ee/app/helpers/projects/security/policies_helper.rb

...ring/components/policy_editor/policy_alert_picker_spec.js

ee/spec/helpers/projects/security/policies_helper_spec.rb

locale/gitlab.pot

spec/features/clusters/create_agent_spec.rb

spec/features/projects/cluster_agents_spec.rb

spec/features/projects/clusters/eks_spec.rb

spec/features/projects/clusters/gcp_spec.rb

spec/features/projects/clusters/user_spec.rb

spec/features/projects/clusters_spec.rb

...ontend/clusters_list/components/agent_empty_state_spec.js

...end/clusters_list/components/clusters_empty_state_spec.js

...ntend/clusters_list/components/clusters_main_view_spec.js