csis: Improve handling connection timeout

Since CSIS is using opportunistic connect, make sure to start if over when
gatt sends OPEN event with a status error, which is usually a case when
direct connect did not succeed.

Bug: 331775328
Flag: Exempt, regression tested with unit test, new test added
Test: atest bluetooth_csis_test
Change-Id: Icc17d7f7a99a033db0b5fe66a2adab7f72a4c8db