multi-emit fsi - multi part submissions breakpoints for are not active until after the block has been stepped into

[KevinRansom]

In this session there are four sperate submissions, all sent in one go by using Alt+A select all then Debug in Fsi from the context menu. Note the Warning triangles:

This happens because each section of code is separated by ;; and executed in a single submission.

Expected: All submitted code to be compiled and then executed.

Note: This behavior requires this PR: #14537

[KevinRansom]

Nothing much we can really do about this right now. FSI is incremental, with submissions building it will take a lot more thought to figure out where the edges are on this.