Investigate 'dotnet test' behavior on solution when passing `--framework`

[Youssef1313]

See xunit/xunit#3375 (comment) and xunit/xunit#3375 (comment)

This is HIGH priority if it's a bug on our side and needs to be fixed in RC2.

FYI @mariam-abdulla @nkolev92

Partially related to the discussion we had in #47093