Overlaying a stageRunner object is taking another stageRunner object with similar stage names and adding the latter's stages as terminal stages to the former (for example, to support tests).
1  | stageRunner_overlay(other_runner, label = NULL, flat = FALSE)
 | 
other_runner | 
 stageRunner. Another stageRunner from which to overlay.  | 
label | 
 character. The label for the overlayed stageRunner. This refers
to the name the former will get wrapped with when appended to the
stages of the current stageRunner. For example, if   | 
flat | 
 logical. Whether to use the   | 
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