Swift Testing (#748)

* Swift Testing: `PrivateChatE2ETests` + minor refactor

* Swift Testing: `PublicChatE2ETests`

* Swift Testing: `FragmentationTests`

* Fix MockBLEService init to accept PeerID and remove _testRegister call

* Add peerID property to MockBLEService and fix ttlDecrement test

* Remove duplicate peerID property and fix type comparisons

---------

Co-authored-by: jack <jackjackbits@users.noreply.github.com>

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