We don't actually use this anywhere, so let's remove it.

https://github.com/facebook/react/blob/f1d00156df5453bc62bd5668fefdcac4ca67e90e/src/renderers/shared/fiber/ReactFiberScheduler.js#L1504-L1512
if (isUnmounting) {
            return null;
          }
           If we're in the commit phase, we should check to see if
           this boundary already captured an error during this commit.
           This case exists because multiple errors can be thrown during
           a single commit without interruption.
          if (
            commitPhaseBoundaries !== null &&
            (commitPhaseBoundaries.has(node) ||
              (node.alternate !== null &&
                commitPhaseBoundaries.has(node.alternate)))
          ) {
            
            return null;
          }
           The error should propagate to the next boundary -— we keep looking.
          boundary = null;
          willRetry = false;
        }
        node = node.return;
      }
    }
    if (boundary !== null) {
       
       
      if (failedBoundaries === null) {