enhance File import info message and disable URL import

Signed-off-by: Riya Garg <riyag1452003@gmail.com>

Author: riyaa14

Diff for: schemas/configuration/modelImport.json

@@ -23,7 +23,7 @@
           "file": {
             "type": "string",
             "format": "file",
-            "description": "Browse the filter file from your file system",
+            "description": "Browse the model file from your file system. Ensure it's an OCI artifact in .tar, .tar.gz, or .tgz format.",
             "x-rjsf-grid-area": "12"
           }
         },

Diff for: schemas/configuration/uiSchemaModelImport.json

@@ -2,5 +2,10 @@
   "uploadType": {
     "ui:widget": "radio"
   },
+
+  "url":{
+    "ui:disabled": true
+  },
+
   "ui:order": ["uploadType", "file", "url"]
 }