Refactor GetBetaGroupOperation

[n-a-f-i-s-a]

📝 Summary of Changes

Closes #180

Changes proposed in this pull request:

• Refactored GetBetaGroupOperation to accept appId and bundleId instead of app
• Changed the following to pass app id and bundle id to GetBetaGroupOperation

1. addTestersToGroup
2. removeTestersFromGroup
3. readBetaGroup
4. deleteBetaGroup
5. modifyBetaGroup

🧐🗒 Reviewer Notes

This refactor is required for using it in betatesters listbygroup command

🔨 How To Test

swift run asc testflight betatesters addgroup <email> iba.test3 testGrp4 swift run asc testflight betagroup modify iba.test3 testGrp4 swift run asc testflight betagroup delete iba.test3 testGrp3 swift run asc testflight betagroup read iba.test3 testGrp3 swift run asc testflight betagroup removeuser iba.test3 testGrp4 <email>