Prevent epilogue if the tier is not 50

## Describe the ideal solution or feature request
The CLI would prevent users from editing epilogue setting without having the battlepass at tier 50 i.e. completed the majority of the battlepass to start progress in the epilogue of the battlepass. Likewise, tier should not be set down to below 50 if epilogue is set to 1 or above. Alternatively, tier could be set to tier 50 automatically if the epilogue settings are modified to 1 or above, and likewise, epilogue is set to 0 if tier is set to a number below 50.

## Difficulty, impact, and usage score
| Technical difficulty | User goals | Usage frequency |
|--------------------| --------------------| --------------------|
| Easy | Medium priority | Daily |

## How does this tie into our current application?
The CLI does allow users to edit the epilogue settings before they have the correct inputs for the tiers which can affect the tracking.