chore(tooling): set zsh to be the default terminal, add xml extension

.devcontainer/devcontainer.json

@@ -7,17 +7,16 @@
     "ghcr.io/devcontainers/features/dotnet:2": {},
     "ghcr.io/nikiforovall/devcontainer-features/dotnet-csharpier:1": {}
   },
-
-  // Use 'forwardPorts' to make a list of ports inside the container available locally.
-  "forwardPorts": [8000],
-  // "portsAttributes": {
-  //		"8000": {
-  //			"protocol": "https"
-  //		}
-  // }
-
   "customizations": {
     "vscode": {
+      "settings": {
+        "terminal.integrated.defaultProfile.linux": "zsh",
+        "terminal.integrated.profiles.linux": {
+          "zsh": {
+            "path": "/bin/zsh"
+          }
+        }
+      },
       "extensions": [
         "ms-dotnettools.csharp",
         "ms-dotnettools.vscodeintellicode-csharp",
@@ -25,6 +24,7 @@
         "patcx.vscode-nuget-gallery",
         "vasubasraj.flashpost",
         "DavidAnson.vscode-markdownlint",
+        "redhat.vscode-xml",
         "aaron-bond.better-comments",
         "donjayamanne.githistory",
         "eamodio.gitlens"