Rename getCaptureMotionContainingTimeStamp() -> findCaptureContainingTimeStamp() !...

Discovered an existing findCaptureContainingTimeStamp() !

So all this was done:

• rename
• select most elegant implementation
• make it const (one was const, the other was not)
• comment out the discarded implementation

enabled an automatic merge when the pipeline for 2ac1b955 succeeds

merged

mentioned in commit 4e207dfa