Remove ProcessStartOptions type, update ref, src and tests

src/libraries/System.Diagnostics.Process/ref/System.Diagnostics.Process.cs

@@ -268,17 +268,6 @@ public ProcessStartInfo(string fileName, System.Collections.Generic.IEnumerable<
         [System.Diagnostics.CodeAnalysis.AllowNullAttribute]
         public string WorkingDirectory { get { throw null; } set { } }
     }
-    public sealed partial class ProcessStartOptions
-    {
-        public ProcessStartOptions(string fileName) { }
-        public System.Collections.Generic.IList<string> Arguments { get { throw null; } set { } }
-        public bool CreateNewProcessGroup { get { throw null; } set { } }
-        public System.Collections.Generic.IDictionary<string, string?> Environment { get { throw null; } }
-        public string FileName { get { throw null; } }
-        public System.Collections.Generic.IList<System.Runtime.InteropServices.SafeHandle> InheritedHandles { get { throw null; } set { } }
-        public bool KillOnParentExit { get { throw null; } set { } }
-        public string? WorkingDirectory { get { throw null; } set { } }
-    }
     [System.ComponentModel.DesignerAttribute("System.Diagnostics.Design.ProcessThreadDesigner, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
     public partial class ProcessThread : System.ComponentModel.Component
     {

src/libraries/System.Diagnostics.Process/src/Resources/Strings.resx

@@ -336,7 +336,4 @@
   <data name="InvalidPerfData" xml:space="preserve">
     <value>Invalid performance counter data with type '{0}'.</value>
   </data>
-  <data name="FileNotFoundResolvePath" xml:space="preserve">
-    <value>Could not resolve the file.</value>
-  </data>
-</root>
+</root>

src/libraries/System.Diagnostics.Process/src/System.Diagnostics.Process.csproj

@@ -27,7 +27,6 @@
     <Compile Include="System\Diagnostics\ProcessModuleCollection.cs" />
     <Compile Include="System\Diagnostics\ProcessPriorityClass.cs" />
     <Compile Include="System\Diagnostics\ProcessStartInfo.cs" />
-    <Compile Include="System\Diagnostics\ProcessStartOptions.cs" />
     <Compile Include="System\Diagnostics\ProcessUtils.cs" />
     <Compile Include="System\Diagnostics\ProcessThread.cs" />
     <Compile Include="System\Diagnostics\ProcessThreadCollection.cs" />