When using SourcePath: PathToFile.PSd1 in build.yaml the build fails

### Problem description

It cannot detect that the thing to build is a module and put the artifact context at "Other"

### Verbose logs

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### Suggested solution

_No response_

### Environment

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Start by reproducing the failure using build.yaml with SourcePath set to PathToFile.PSd1. Trace how the build identifies the source as a module and assigns the artifact context. Done means the module is detected correctly and the artifact context is no longer "Other".

Written by the indexing model from the issue text.