Pulp2 to Pulp3 content migration fails with error "Some corrupted or missing content found" in Red Hat Satellite 6.9

Issue

• The satellite-maintain content prepare command fails with the following error:

  2022-06-15 08:02:08 +0200: Importing migrated content type erratum: 166000/165321
  2022-06-15 08:02:18 +0200: Importing migrated content type erratum: 166000/165321
  2022-06-15 08:02:28 +0200: Importing migrated content type package_group: 350/958
  
  Some corrupted or missing content found, run 'foreman-maintain content migration-stats' for more information.
  
  E, [2022-06-15 08:02:39+0200 #3374] ERROR -- : Failed executing preserve_output=true foreman-rake katello:pulp3_migration, exit status 255 (ForemanMaintain::Error::ExecutionError)
  /usr/share/gems/gems/foreman_maintain-0.8.30/lib/foreman_maintain/utils/command_runner.rb:54:in `execution_error'
  /usr/share/gems/gems/foreman_maintain-0.8.30/lib/foreman_maintain/concerns/system_helpers.rb:68:in `execute!'
  /usr/share/gems/gems/foreman_maintain-0.8.30/definitions/procedures/content/prepare.rb:14:in `run'
  /usr/share/gems/gems/foreman_maintain-0.8.30/lib/foreman_maintain/executable.rb:139:in `__run__'
  

• The satellite-maintain content migration-stats command displays the following information about the error:

  ============Missing/Corrupted Content Summary================
  WARNING: MISSING OR CORRUPTED CONTENT DETECTED
  Corrupted or Missing Rpm: 1000/173142
  Corrupted or missing content has been detected, you can examine the list of content in /tmp/unmigratable_content-20220109-11817-1oil4a6 and take action by either:
  1. Performing a 'Verify Checksum' sync under Advanced Sync Options, let it complete, and re-running the migration
  2. Deleting/disabling the affected repositories and running orphan cleanup (foreman-rake katello:delete_orphaned_content) and re-running the migration
  3. Manually correcting files on the filesystem in /var/lib/pulp/content/ and re-running the migration
  4. Mark currently corrupted or missing content as skipped (foreman-rake katello:approve_corrupted_migration_content).  This will skip migration of missing or corrupted content.