Fix self contained bug

Author: GarrettBeatty

.autover/changes/8a5204e4-83ec-45ac-8c75-27512ae9cdf8.json

@@ -4,7 +4,8 @@
       "Name": "Amazon.Lambda.Tools",
       "Type": "Patch",
       "ChangelogMessages": [
-        "Update logic for finding project properties to use MSBuild instead of parsing the project file directly. See https://learn.microsoft.com/en-us/visualstudio/msbuild/customize-your-build?view=vs-2022 for more details."
+        "Update logic for finding project properties to use MSBuild instead of parsing the project file directly. See https://learn.microsoft.com/en-us/visualstudio/msbuild/customize-your-build?view=vs-2022 for more details.",
+        "Fix 'SelfContained' property reading logic to actually read the value from the properties. Previously we were only checking that the value could be parsed and not reading the actual value."
       ]
     }
   ]

src/Amazon.Common.DotNetCli.Tools/Utilities.cs

@@ -372,7 +372,7 @@ public static bool HasExplicitSelfContainedFlag(string projectLocation, string m
             var properties = LookupProjectProperties(projectLocation, "SelfContained");
             if (properties.TryGetValue("SelfContained", out var selfContained))
             {
-                return bool.TryParse(selfContained, out _);
+                return bool.TryParse(selfContained, out var isSelfContained) && isSelfContained;
             }
 
             return false;