MSbuildProjectLoader.LoadProjectInfoAsync should allow skipping unrecognized projects

`LoadSolutionInfoAsync` uses `SkipUnrecognizedProjects` property to determine whether to throw on unrecognized project.
`LoadProjectInfoAsync` uses that property as well, but only for discovered projects. It is hardcoded to throw exception when requested projects are unrecognized.

The caller needs to handle unrecognized projects in two ways:
- hook up WorkspaceFailed
- catch a general `InvalidOperationException` around the entire load call

It'd be better if `LoadProjectInfoAsync` honored `SkipUnrecognizedProjects` for all projects. IF the requested project is not recognized it'd return empty array.

Related: https://github.com/dotnet/roslyn/issues/75170

Start by comparing LoadProjectInfoAsync with LoadSolutionInfoAsync, focusing on how each uses SkipUnrecognizedProjects. Trace the requested-project path and the existing exception behavior. Done means unrecognized requested projects are skipped and produce an empty array when the property is enabled, with coverage for both enabled and disabled behavior.

Written by the indexing model from the issue text.