chore: Specify rust-analyzer.linkedProjects after noir-repo move (#4922)

rust-analyzer only is working when `noir-repo` is specified as the root
project in VS code. rust-analyzer should work when `aztec-packages` is
specified as the root. Sometimes when working on Noir we want to have
`aztec-packages` as our root as we may be working across the
Noir/barretenberg boundary. Now that `noir` is a subdirectory under
`noir/noir-repo` we must specify it is a linked project in the VS code
settings.

.vscode/settings.json

@@ -155,5 +155,8 @@
   "C_Cpp.vcpkg.enabled": false,
   "C_Cpp.default.includePath": [
     "barretenberg/cpp/src"
-  ]
+  ],
+  "rust-analyzer.linkedProjects": [
+    "noir/noir-repo/Cargo.toml"
+  ] 
 }