Paket convert-from-nuget crash on nuget syntax #3151

Description

paket does not read nuget constraints before parsing SemVer

Repro steps

1. Create a project
2. Add a package

  <ItemGroup>
    <PackageReference Include="MyPackage" Version="[1.0.0]" />
  </ItemGroup>

3. Run dotnet restore
4. It works
5. paket convert-form-nuget --force
   bang

Paket failed with
-> Can't parse "[1.0.0]". System.ArgumentException: SemVer.Parse

Expected behavior

Read nuget constraints syntax

Actual behavior

Crash on convert

Known workarounds

None