Key removal for Rate limit email

data/removals/14_9/14-9-key-user_email_lookup_limit.yml

+- name: "Rate limit key from 'user_email_lookup_limit"
+  announcement_milestone: "14.9"
+  announcement_date: "2022-03-22"
+  removal_milestone: "14.9"
+  removal_date: "2022-03-22"
+  breaking_change: false
+  reporter: JohnMcGuire
+  body: |
+    We have renamed the rate limit key from 'user_email_lookup_limit' to 'search_rate_limit'.