fix missing retry for npm install of datadog-ci (#5625)

Author: rochdev

.github/actions/push_to_test_optim/action.yml

@@ -12,7 +12,7 @@ runs:
   steps:
     - name: Install datadog-ci
       shell: bash
-      run: npm install -g @datadog/datadog-ci
+      run: npm install -g @datadog/datadog-ci || sleep 60 && npm install -g @datadog/datadog-ci
 
     - name: checkout owner repo
       uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0