dillon1000/react

[Transition Tracing] Add Tracing Marker Stack (#24661)

When a suspense boundary suspends or commits, we need to notify the corresponding tracing markers so that they know when to log that they've completed. To do this, we add a stack of tracing markers. In the begin phase, we will push the tracing markers onto the stack, and during the complete/unwind phase we will pop the tracing markers off the stack

In a later PR, we will store the active tracing markers on the suspense boundary, and during the commit phase we will process the active tracing markers by adding/removing the boundary as appropriate.