feat(flagd-core): add disabled flag evaluation e2e BDD scenarios

Signed-off-by: Jonathan Norris <jonathan.norris@dynatrace.com>

Author: jonathannorris

tools/openfeature-flagd-core/tests/e2e/features/disabled.feature

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+@disabled
+Feature: Disabled flag evaluation
+
+  # A flag with state=DISABLED resolves with reason=DISABLED and no value or
+  # variant; the SDK returns the caller's code default.
+  # Relates to: https://github.com/open-feature/flagd/issues/1965
+
+  Scenario Outline: Evaluating a disabled flag returns reason DISABLED and code default
+    Given an evaluator
+    And a <type>-flag with key "<key>" and a fallback value "<default>"
+    When the flag was evaluated with details
+    Then the resolved details value should be "<default>"
+    And the reason should be "DISABLED"
+
+    Examples:
+      | key                   | type    | default |
+      | disabled-boolean-flag | Boolean | false   |
+      | disabled-string-flag  | String  | bye     |
+      | disabled-integer-flag | Integer | 1       |
+      | disabled-float-flag   | Float   | 0.1     |
+      | disabled-object-flag  | Object  | {}      |

tools/openfeature-flagd-core/tests/e2e/test_disabled.py

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+import json
+from pathlib import Path
+
+import pytest
+from pytest_bdd import scenarios
+
+from openfeature.contrib.tools.flagd.core import FlagdCore
+from openfeature.contrib.tools.flagd.testkit.steps import *  # noqa: F403
+
+scenarios(str(Path(__file__).parent / "features"))
+
+_DISABLED_FLAGS = json.dumps(
+    {
+        "flags": {
+            "disabled-boolean-flag": {
+                "state": "DISABLED",
+                "variants": {"on": True, "off": False},
+                "defaultVariant": "on",
+            },
+            "disabled-string-flag": {
+                "state": "DISABLED",
+                "variants": {"greeting": "hi", "parting": "bye"},
+                "defaultVariant": "greeting",
+            },
+            "disabled-integer-flag": {
+                "state": "DISABLED",
+                "variants": {"one": 1, "ten": 10},
+                "defaultVariant": "ten",
+            },
+            "disabled-float-flag": {
+                "state": "DISABLED",
+                "variants": {"tenth": 0.1, "half": 0.5},
+                "defaultVariant": "half",
+            },
+            "disabled-object-flag": {
+                "state": "DISABLED",
+                "variants": {
+                    "empty": {},
+                    "template": {
+                        "showImages": True,
+                        "title": "Check out these pics!",
+                        "imagesPerPage": 100,
+                    },
+                },
+                "defaultVariant": "template",
+            },
+        }
+    }
+)
+
+
+@pytest.fixture
+def evaluator():
+    core = FlagdCore()
+    core.set_flags(_DISABLED_FLAGS)
+    return core