Include `sc_admin` Role for Splunk Cloud Accessibility

[EatMoreChicken]

• Description: The metadata/default.meta file assigns the admin role to certain knowledge objects, but this role is not available in Splunk Cloud. Adding the sc_admin role ensures that these objects are accessible to Splunk Cloud administrators.
• Raw Splunk Report Description: The 'admin' role is not available to Splunk Cloud customers. Please consider also including the 'sc_admin' role.
• Possible Fix: Update the metadata/default.meta file to include the sc_admin role for the relevant knowledge objects.