Update staking/progress endpoint to handle breaking changes #1611
Description
Description
In this PR there is a change in the UnappliedSlashes query that needs to be updated also in Sidecar.
It changed from StorageMap to StorageDoubleMap which needs to be updated in staking/progress endpoint here.
Test
You can test the breaking change currently in Westend.
Notes
Check the rest of the changes in the PR in case more updates need to be done in Sidecar.