Rename "Security labels" => "Security attributes"

Things to change to "attributes":

• Security labels tab name
• s__('SecurityLabels|*') i18n namespace
• Labels as a form field
• Edit security label drawer title
• Add label/Delete label buttons
• Custom permission name and description
• GraphQL data types
• security_labels folder we put the components in
• configure_labels.vue, label_delete_modal.vue, label_drawer.vue, label_form.vue components
• admin_security_labels permission + custom_ability_admin_security_labels feature flag
• security_labels licensed feature

Not changed:

• security_context_labels feature flag, which should be short-lived anyway