Fix duplicate solution file when creating an AI Chat Web app from VS (#6653)

Author: MackinnonBuck

src/ProjectTemplates/Microsoft.Extensions.AI.Templates/src/ChatWithCustomData/.template.config/template.json

@@ -30,7 +30,7 @@
       "path": "./ChatWithCustomData-CSharp.csproj"
     },
     {
-      "condition": "(IsAspire && (HostIdentifier == \"dotnetcli\" || HostIdentifier == \"dotnetcli-preview\"))",
+      "condition": "(IsAspire && (hostIdentifier == \"dotnetcli\" || hostIdentifier == \"dotnetcli-preview\"))",
       "path": "./ChatWithCustomData-CSharp.sln"
     },
     {
@@ -75,6 +75,12 @@
           "README.Aspire.md": "README.md"
         }
       },
+      {
+        "condition": "(IsAspire && hostIdentifier != \"dotnetcli\" && hostIdentifier != \"dotnetcli-preview\")",
+        "exclude": [
+          "*.sln"
+        ]
+      },
       {
         "condition": "(!UseLocalVectorStore)",
         "exclude": [
@@ -558,7 +564,7 @@
     }
   },
   "postActions": [{
-    "condition": "(hostIdentifier != \"dotnetcli\")",
+    "condition": "(hostIdentifier != \"dotnetcli\" && hostIdentifier != \"dotnetcli-preview\")",
     "description": "Opens README file in the editor",
     "manualInstructions": [ ],
     "actionId": "84C0DA21-51C8-4541-9940-6CA19AF04EE6",