[ECO-4695] Unskip presense tests

[maratal]

Closes https://github.com/ably/ably-cocoa/issues/1889

Tests look much better now - https://test-observability.herokuapp.com/repos/ably/ably-cocoa/uploads?branches%5B%5D=fix%2F1889-unskip-presense-tests-looped-5&createdBefore=&createdAfter=2024-05-06T22%3A10%3A42.078Z&failureMessage=

Further runs in a loop show that test__110__Presence__get__Query__set_of_params___waitForSync_is_true__should_wait_until_SYNC_is_complete_befo_re_returning_a_list_of_members and test__080__Presence__private_and_internal_PresenceMap_containing_only_members_that_match_the_current_connec_tionId__any_ENTER__PRESENT__UPDATE_or_LEAVE_event_that_matches_the_current_connectionId_should_be_applied_to_this_object needs investigation. Haven't seen them fail that frequently in other loops.