Update installing cdk cli

Author: Michael Kaiser

.github/workflows/build-pull-request.yml

@@ -45,7 +45,8 @@ jobs:
         run: |
           # Create a temporary directory for build logs
           mkdir -p /tmp/build_logs
-          npm install -g eslint > /dev/null
+          yarn global add eslint@latest
+          yarn global add aws-cdk@latest
           # Function to build a single file
           build_file() {
             echo "Build File $1"
@@ -127,13 +128,6 @@ jobs:
           # Change to language directory
           cd ./${{ matrix.language }}
 
-          # install CDK CLI from npm if not typescript, so that npx can find it later
-          # ts will use the one from the particular cdk app
-          if [[ ${{ matrix.language }} != 'typescript' ]]; then
-            npm install -g aws-cdk
-            npx cdk --version
-          fi
-
           # Run the build_file function in parallel for each project to be built
           # Halt the execution if any of the build_file invocations fail
           echo "::group::Build Output"