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/services/featuremgmt/testdata/features.yaml

@@ -1,33 +0,0 @@
-include:
- - included.yaml # not yet supported
-
-vars: 
-  stack: something
-  level: free
-  valA: value from features.yaml
-
-flags: 
-  - name: feature1
-    description: feature1
-    expression: "false"
-
-  - name: feature3
-    description: feature3
-    expression: "true"
-
-  - name: feature3
-    description: feature3
-    expression: env.level == 'free'
-
-  - name: displaySwedishTheme
-    description: enable swedish background theme
-    expression: |
-      // restrict to users allowing swedish language
-      req.locale.contains("sv")
-  - name: displayFrenchFlag
-    description: sho background theme
-    expression: |
-      // only admins
-      user.id == 1
-      // show to users allowing french language
-      && req.locale.contains("fr")