Resort to Azimuth UI schema for context length validation

Author: sd109

chart/values.schema.json

@@ -97,9 +97,8 @@
             "type": "object",
             "properties": {
                 "modelMaxContextLength": {
-                    "type": "string",
                     "title": "Model Context Length",
-                    "description": "An override for the maximum context length to use if the model's default is not suitable."
+                    "description": "An override for the maximum context length to allow, if the model's default is not suitable."
                 },
                 "image": {
                     "type": "object",