SurfaceComposerClient: Handle transaction apply sync timeouts

We switched to using transaction complete callbacks to handle
transaction#apply(/*sync*/=true). The callback object was
destroyed after waiting for the callback. In the event of a
timeout, the callback would access an invalid object.

Fix this by using ref counted object to ensure the context
remains valid.

Fixes: 261679196
Test: atest SurfaceFlinger_test
Change-Id: I4f840214672dd4051cb57b9551bf20802cc90890