Updated group for FF

In the course of updating the group details for
the existing feature flags, this commit marks
those owned by group::editor

config/feature_flags/development/monaco_blobs.yml

 ---
 name: monaco_blobs
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url:
+rollout_issue_url:
+group: group::editor
 type: development
 default_enabled: true

config/feature_flags/development/snippets_binary_blob.yml

 ---
 name: snippets_binary_blob
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url:
+rollout_issue_url:
+group: group::editor
 type: development
 default_enabled: false

config/feature_flags/development/snippets_vue.yml

 ---
 name: snippets_vue
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url:
+rollout_issue_url:
+group: group::editor
 type: development
 default_enabled: true

config/feature_flags/development/webperf_experiment.yml

 ---
 name: webperf_experiment
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url:
+rollout_issue_url:
+group: group::editor
 type: development
 default_enabled: false