[App Config] az appconfig kv import\export: Fix bug when importing …

…feature flag with percentile allocation property (Azure#30732)

src/azure-cli/azure/cli/command_modules/appconfig/_featuremodels.py

@@ -366,15 +366,15 @@ class FeaturePercentileAllocation:
 
     :ivar str variant:
         The name of the variant to use if the calculated percentile for the current user falls in the provided range.
-    :ivar number from_:
+    :ivar number from:
         The lower end of the percentage range for which this variant will be used.
     :ivar number to:
         The upper end of the percentage range for which this variant will be used.
     """
 
     def __init__(self, variant, from_, to):
         self.variant = variant
-        self.from_ = from_
+        setattr(self, "from", from_)
         self.to = to
 
     @classmethod
@@ -435,7 +435,7 @@ def convert_from_dict(cls, percentile_allocation_dict):
     def __repr__(self):
         feature_percentile_allocation = {
             FeatureFlagConstants.VARIANT: self.variant,
-            FeatureFlagConstants.FROM: self.from_,
+            FeatureFlagConstants.FROM: getattr(self, "from"),
             FeatureFlagConstants.TO: self.to,
         }
 

src/azure-cli/azure/cli/command_modules/appconfig/tests/latest/import_features_new_fm_schema.json

@@ -8,6 +8,13 @@
             "client_filters": []
           },
           "allocation": {
+            "percentile": [
+              {
+                "variant": "Off",
+                "to": 100,
+                "from": 0
+              }
+            ],
             "user": [
               {
                 "variant": "Alpha",