Remove pull_request from context event map so that accesss to github.event.pull_request are not considered a source for pull_request triggers

Author: Alvaro Muñoz

ql/lib/ext/config/context_event_map.yml

@@ -17,10 +17,6 @@ extensions:
       - ["issue_comment", "github.event.changes"] 
       - ["gollum", "github.event.pages"] 
       - ["gollum", "github.event.changes"] 
-      - ["merge_group", "github.event.merge_group"] 
-      - ["pull_request", "github.event.pull_request"] 
-      - ["pull_request", "github.head_ref"] 
-      - ["pull_request", "github.event.changes"] 
       - ["pull_request_comment", "github.event.comment"] 
       - ["pull_request_comment", "github.event.pull_request"] 
       - ["pull_request_comment", "github.head_ref"] 

ql/lib/ext/config/externally_triggereable_events.yml

@@ -9,7 +9,6 @@ extensions:
       - ["watch"]
       - ["issue_comment"]
       - ["issues"]
-      - ["pull_request"] # non-privileged
       - ["pull_request_comment"]
       - ["pull_request_review"]
       - ["pull_request_review_comment"]