Cleaning up legacy disappearing messages

[RyanRory]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 22.91667% with 74 lines in your changes missing coverage. Please review.

Project coverage is 12.24%. Comparing base (e4d07fc) to head (bc02720). Report is 18 commits behind head on dev.

:exclamation: Current head bc02720 differs from pull request most recent head 1b88bbb

Please upload reports for the commit 1b88bbb to get more accurate results.

Files	Patch %	Lines
.../ThreadDisappearingMessagesSettingsViewModel.swift	15.87%	53 Missing :warning:
...sations/Views & Modals/ConversationTitleView.swift	0.00%	8 Missing :warning:
...base/Models/DisappearingMessageConfiguration.swift	64.28%	5 Missing :warning:
...sages/Control Messages/ExpirationTimerUpdate.swift	0.00%	2 Missing :warning:
SessionMessagingKit/Messages/Message.swift	0.00%	2 Missing :warning:
Session/Conversations/ConversationVC.swift	0.00%	1 Missing :warning:
...bSession/Config Handling/LibSession+Contacts.swift	0.00%	1 Missing :warning:
...ge Handling/MessageReceiver+ExpirationTimers.swift	0.00%	1 Missing :warning:
SessionUIKit/Components/TopBannerController.swift	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #970      +/-   ##
==========================================
- Coverage   12.26%   12.24%   -0.02%     
==========================================
  Files         651      651              
  Lines       96623    96245     -378     
==========================================
- Hits        11850    11789      -61     
+ Misses      84773    84456     -317     

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