[Tests] More consistent naming (#40754)

- [x] **Tests:** Added/updated and all pass
- [x] **Dev docs:** Added/updated

<img width="460" height="1017" alt="image"
src="https://github.com/user-attachments/assets/e72bf221-0875-48c3-b790-4ab1182c7d3a"
/>

I haven't touched the Run module, since we may deprecate it.

Closes: #40788

src/modules/colorPicker/ColorPickerUI.UnitTests/ColorPickerUI.UnitTests.csproj

@@ -3,15 +3,15 @@
   <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
 
   <PropertyGroup>
-    <ProjectGuid>{090CD7B7-3B0C-4D1D-BC98-83EB5D799BC1}</ProjectGuid>
-    <RootNamespace>Microsoft.ColorPicker.UnitTests</RootNamespace>
+    <ProjectGuid>{F93C2817-C846-4259-84D8-B39A6B57C8DE}</ProjectGuid>
+    <RootNamespace>ColorPicker.UnitTests</RootNamespace>
     <IsPackable>false</IsPackable>
     <Nullable>enable</Nullable>
     <OutputType>Library</OutputType>
   </PropertyGroup>
 
   <PropertyGroup>
-    <OutputPath>..\..\..\..\$(Platform)\$(Configuration)\tests\UnitTest-ColorPickerUI\</OutputPath>
+    <OutputPath>..\..\..\..\$(Platform)\$(Configuration)\tests\ColorPickerUI.UnitTest\</OutputPath>
   </PropertyGroup>
 
   <ItemGroup>

src/modules/colorPicker/ColorPickerUI.UnitTests/Helpers/ColorConverterTest.cs

@@ -9,7 +9,7 @@ using System.Globalization;
 using ManagedCommon;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
-namespace Microsoft.ColorPicker.UnitTests
+namespace ColorPicker.UnitTests.Helpers
 {
     /// <summary>
     /// Test class to test <see cref="ColorConverter"/>

src/modules/colorPicker/ColorPickerUI.UnitTests/Helpers/ColorRepresentationHelperTest.cs

@@ -8,7 +8,7 @@ using ColorPicker.Helpers;
 using ManagedCommon;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
-namespace Microsoft.ColorPicker.UnitTests
+namespace ColorPicker.Helpers
 {
     [TestClass]
     public class ColorRepresentationHelperTest

src/modules/colorPicker/ColorPickerUI/Helpers/ColorRepresentationHelper.cs

@@ -34,7 +34,7 @@ namespace ColorPicker.Helpers
         /// <param name="color">The <see cref="Color"/> for the presentation</param>
         /// <param name="colorRepresentationType">The type of the representation</param>
         /// <returns>A <see cref="string"/> representation of a color</returns>
-        internal static string GetStringRepresentation(Color color, string colorRepresentationType, string colorFormat)
+        public static string GetStringRepresentation(Color color, string colorRepresentationType, string colorFormat)
         {
             if (string.IsNullOrEmpty(colorFormat))
             {