Resume only after connection complete event

The le state machine is guaranteed complete only
When the cancel connection event comes back.
Currently the stack progresses only after the command
is acknowledged.

Bug: 228653837
Tag: #refactor
Test: gd/cert/run
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: Ic1b29b52afb4ae985814b5ae1dbb6c64f6c3c084