[FEATURE REQUEST] Manual removal of local storage

[jesmrec]

EPIC:

• [EPIC] New "Manage accounts" view #4314

This one may be done after #4148

Context: #4002 (comment)

New option in "Manage Accounts" to clean the account up. Will be removed:

• All downloaded files that are not av. offline
• /tmp folder -> not finally, since in the automatic removal we realised we cannot remove the temporal files
• failed uploads list

how to show to option in the UI?

• Broom icon (available in material?) + warning about the behaviour like All downloaded and temporal files and failed uploaded will be cleaned up
• Gear to open a new view in which other options could be added (iOS style):

• Other ideas ¿? @Aitorbp @manuelplazaspalacio @JuancaG05

More ACs:

• During the process, an spinner or similar should be displayed to let users know that the process is running.
• When the downloaded files are removed, the last usage date will be cleaned up
• Lack of connection to internet or to the server will not affect

TASKS

• Research (if needed)
• Create branch feature/manual_removal_local_storage
• Development tasks
  • Create DAO with SELECT * files
  • Create datasource and repository
  • Create UseCase: deleteTemporal function, selectAllFiles repository and RemoveFile usecase.
  • Add function in ViewModel: implement loading and usecase
  • Create UI
  • Add unit test if it is necessary
  • Add release notes
  • Add calens
• Code review and apply changes requested
• Design test plan
• QA
• Merge branch feature/manual_removal_local_storage into master