Remove loop-build harness and associated configuration files.

loop-build/config/denylist.txt

@@ -0,0 +1,24 @@
+sudo
+rm -rf
+rm -fr
+curl
+wget
+git clone
+git push
+git pull
+git commit
+git rebase
+git reset
+npm install
+npm i
+yarn add
+yarn install
+pnpm add
+pnpm install
+pip install
+pip3 install
+composer install
+bash -c
+sh -c
+curl | bash
+wget | sh