v0rc1.1.8.5

Handle export data status panics (#1874)

1. Handling nil pointer and the index out-of-range issues while running export data status before, during, and after export data.
2. Handled panics in `get data-migration report`, when it was run before export was started.
3. Fixed a bug in the `export data status` for partitions case from PG where we club the statuses of all leaf table to root tables's entry, which was not showing the progress of partitions and was just showing the NOT-STARTED for the entire duration of export data and was showing the DONE one it is completed.
4. Fixed the output of the export data status for the Debezium export case of PG partitions with table-list
5. Added expected files to be validated in pg-partitions automation test for table-list case of export-data-status command.