Error when sub-modules are already built is confusing

[mkorbel1]

Motivation

If a top-level module has it's build called after some sub-modules have already called build separately, then you may get an error like the ModuleNotBuiltException when running it through a Synthesizer. While this order of operations might lead to the error being technically true, it's not a helpful error message for new-comers to ROHD.

Desired solution

Clarify in error messaging, and try to detect the scenario, when submodules have incorrectly been pre-built before the top-level build.

Alternatives considered

No response

Additional details

No response