FeatureFlags: Revert managing feature flags outside of settings.Cfg (#44382)

* Revert "FeatureToggles: register all enterprise feature toggles (#44336)"

This reverts commit f53b3fb007.

* Revert "FeatureFlags: manage feature flags outside of settings.Cfg (#43692)"

This reverts commit f94c0decbd.

pkg/setting/setting_feature_toggles_test.go

@@ -14,6 +14,7 @@ func TestFeatureToggles(t *testing.T) {
 		conf            map[string]string
 		err             error
 		expectedToggles map[string]bool
+		defaultToggles  map[string]bool
 	}{
 		{
 			name: "can parse feature toggles passed in the `enable` array",
@@ -57,6 +58,18 @@ func TestFeatureToggles(t *testing.T) {
 			expectedToggles: map[string]bool{},
 			err:             strconv.ErrSyntax,
 		},
+		{
+			name: "should override default feature toggles",
+			defaultToggles: map[string]bool{
+				"feature1": true,
+			},
+			conf: map[string]string{
+				"feature1": "false",
+			},
+			expectedToggles: map[string]bool{
+				"feature1": false,
+			},
+		},
 	}
 
 	for _, tc := range testCases {
@@ -68,7 +81,12 @@ func TestFeatureToggles(t *testing.T) {
 			require.ErrorIs(t, err, nil)
 		}
 
-		featureToggles, err := ReadFeatureTogglesFromInitFile(toggles)
+		dt := map[string]bool{}
+		if len(tc.defaultToggles) > 0 {
+			dt = tc.defaultToggles
+		}
+
+		featureToggles, err := overrideDefaultWithConfiguration(f, dt)
 		require.ErrorIs(t, err, tc.err)
 
 		if err == nil {