Conclude direct connection requests on connection failure

The connection manager removes the pending connection requests for a device when GATT informs that the connection attempt has concluded. If the connection attempt fails, GATT does not inform the connection manager. As a result, subsequent direct connection attempt requests from the same connection manager clients are rejected.

Change-Id: I6025a80eb9fcf85e8d47aa0e21077c1cc10c02b7
Test: mmm packages/modules/Bluetooth
Flag: EXEMPT bugfix
Bug: 394614729