[AI-FSSDK] [FSSDK-12337] Move flag_variation_map after rollout injection

Move @flag_variation_map generation to after the feature rollout
injection block so the everyone-else variation is included in
get_variation_from_flag lookups used by forced decisions.

Author: FarhanAnjum-opti

lib/optimizely/config/datafile_project_config.rb

@@ -180,7 +180,6 @@ def initialize(datafile, logger, error_handler)
         @all_segments.concat Audience.get_segments(audience['conditions'])
       end
 
-      @flag_variation_map = generate_feature_variation_map(@feature_flags)
       @all_experiments = @experiment_id_map.merge(@rollout_experiment_id_map)
       @all_experiments.each do |id, exp|
         variations = exp.fetch('variations')
@@ -229,6 +228,9 @@ def initialize(datafile, logger, error_handler)
         end
       end
 
+      # Generate flag_variation_map after injection so it includes everyone-else variations
+      @flag_variation_map = generate_feature_variation_map(@feature_flags)
+
       # Adding Holdout variations in variation id and key maps
       return unless @holdouts && !@holdouts.empty?