Revert "chore: save exclusion rules when bumping the CFN spec (#22788)"

This reverts commit 4e7fdae, because
the problem it was intended to solve was fixed in a different way, and
this particular approach causes automation to time-out after >1H.

scripts/bump-cfnspec.sh

@@ -27,10 +27,6 @@ cd ${pwd}/packages/@aws-cdk/cfnspec
 yarn update
 version=$(cat cfn.version)
 
-# Running a full build saving awslint exclusion rules in case any of them fails
-export AWSLINT_SAVE=true
-yarn lerna run build --stream --include-dependencies
-
 # Come back to root, add all files to git and commit
 cd ${pwd}
 git add .