VS: move Solution Items folder out of scripts (#3919)

TestPlatform.sln

@@ -98,7 +98,11 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{E344E0A2-7715-4C7F-BAF7-D64EA94CB19B}"
  ProjectSection(SolutionItems) = preProject
  .editorconfig = .editorconfig
+ azure-pipelines.yml = azure-pipelines.yml
+ Directory.Build.props = Directory.Build.props
+ global.json = global.json
  Nuget.config = Nuget.config
+ THIRD-PARTY-NOTICES.txt = THIRD-PARTY-NOTICES.txt
  EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.TestPlatform.AcceptanceTests", "test\Microsoft.TestPlatform.AcceptanceTests\Microsoft.TestPlatform.AcceptanceTests.csproj", "{DD9382B5-5EC4-4B3D-BEB7-95423731AE29}"
@@ -482,7 +486,6 @@ Global
  {BFF7714C-E5A3-4EEB-B04B-5FA47F29AD03} = {020E15EA-731F-4667-95AF-226671E0C3AE}
  {0D4DF78D-7E5F-4516-B19F-E6AA71A1DBF4} = {EE49F5DC-5835-4AE3-B3BA-8BDE0AD56330}
  {DED1590A-ED25-413B-8590-006A4DD5B2FD} = {EE49F5DC-5835-4AE3-B3BA-8BDE0AD56330}
- {E344E0A2-7715-4C7F-BAF7-D64EA94CB19B} = {EE49F5DC-5835-4AE3-B3BA-8BDE0AD56330}
  {DD9382B5-5EC4-4B3D-BEB7-95423731AE29} = {46250E12-4CF1-4051-B4A7-80C8C06E0068}
  {156F8811-28BB-4EC7-87D9-434F10FB7DBE} = {46250E12-4CF1-4051-B4A7-80C8C06E0068}
  {A5B167ED-873A-4762-9326-5F43B8D3AFF6} = {595BE9C1-E10F-4E50-938A-E6C248D3F950}