Provide a option to download the mappings from contentid and entityid for CMAs

Some customer has third-party software in their environment which have a direct link or routing rules to specific, Confluence pages, Jira filters, Jira dashboard, and other entities which have a unique id.

When migrating using CMAs those IDs are remapped in the cloud, please provide an option to download a .csv or a .json file with the list of the old mapping and the new mapping id for those, so the customer can correct their internal rules or redirects to the new IDs.