Run quick-check only if commit is NOT part of a PR

Without a mechanism to check this in the workflow trigger,
we instead run the workflow but skip all jobs if the commit belongs to a PR.

This effectively means that commits-without-PR will run quick-check, and commits-with-PR
will run full-check.

.github/workflows/ci-full-check.yml

@@ -3,17 +3,10 @@ name: CI-full-check
 on:
   workflow_dispatch:
   pull_request:
-    types:
-      - assigned
-      - review_requested
   push:
     branches: 
       - main
       - release/**
-    paths:
-      - '.github/**'
-      - 'dist/**'
-      - '**/action.yml'
 
 jobs:
   build-distribution: