Make RemoteService propagate Context#bindService failure to PendingRequests

...and fix the attached bug which was caused by infinite wait due to lack
of said signal

Fixes: 129549258
Bug: 126266412
Test: - atest CtsContentCaptureServiceTestCases
- Ensure b/129549258#comment5 no longer reproduces
Change-Id: Id434ce268ca4ae6aa09140a3e17b6d8f476f3d9f