trace2: messages in new file

Move Trace2 messages into a new file. The Trace2 file was getting a bit
long and unwieldy, so this change is intended to separate it in a logical
way into two smaller files that are (hopefully) easier to parse and reason
about.

Author: ldennington

src/shared/Core.Tests/Trace2MessageTests.cs

@@ -0,0 +1,17 @@
+using GitCredentialManager;
+using Xunit;
+
+namespace Core.Tests;
+
+public class Trace2MessageTests
+{
+    [Theory]
+    [InlineData(0.013772,    "  0.013772 ")]
+    [InlineData(26.316083,   " 26.316083 ")]
+    [InlineData(100.316083,  "100.316083 ")]
+    public void BuildTimeSpan_Match_Returns_Expected_String(double input, string expected)
+    {
+        var actual = Trace2Message.BuildTimeSpan(input);
+        Assert.Equal(expected, actual);
+    }
+}

src/shared/Core.Tests/Trace2Tests.cs

@@ -27,14 +27,4 @@ public void TryGetPipeName_Windows_Returns_Expected_Value(string input, string e
         Assert.True(isSuccessful);
         Assert.Matches(actual, expected);
     }
-
-    [Theory]
-    [InlineData(0.013772,    "  0.013772 ")]
-    [InlineData(26.316083,   " 26.316083 ")]
-    [InlineData(100.316083,  "100.316083 ")]
-    public void BuildTimeSpan_Match_Returns_Expected_String(double input, string expected)
-    {
-        var actual = Trace2Message.BuildTimeSpan(input);
-        Assert.Equal(expected, actual);
-    }
 }