Add "x-intellij-html-description" fields for partial-pyright.json (#3530)

* Add x-intellij-html-description fields for partial-pyright.json

* Add "x-intellij-html-description" to unknownKeywords in schema-validation.json

* Exempt pyproject.json too

Author: InSyncWithFoo

src/schema-validation.json

@@ -836,7 +836,11 @@
           "poetry.json",
           "ruff.json"
         ],
-        "unknownKeywords": ["x-taplo", "x-taplo-info"],
+        "unknownKeywords": [
+          "x-taplo",
+          "x-taplo-info",
+          "x-intellij-html-description"
+        ],
         "unknownFormat": [
           "uint16",
           "uint8",
@@ -1029,6 +1033,11 @@
         "unknownFormat": ["<app> <your args>"]
       }
     },
+    {
+      "partial-pyright.json": {
+        "unknownKeywords": ["x-intellij-html-description"]
+      }
+    },
     {
       "rudder-techniques.json": {
         "unknownFormat": ["markdown"],