[8.13](backport #38610) Comment the buildkite upload step (#38613)

This is done to disable the execution of the dynamic pipeline.

Signed-off-by: Alexandros Sapranidis <alexandros@elastic.co>
(cherry picked from commit 9e33668)

Co-authored-by: Alexandros Sapranidis <alexandros@elastic.co>

.buildkite/scripts/generate_pipeline.sh

@@ -12,5 +12,6 @@ chmod a+x /usr/bin/yq
 echo "+++ Run pipeline generator in dry-run mode"
 python3 .buildkite/pipeline.py | yq .
 
-echo "~~~ Upload pipeline"
-python3 .buildkite/pipeline.py | buildkite-agent pipeline upload
+# Temporary commenting this, until we restart this work-stream
+#echo "~~~ Upload pipeline"
+#python3 .buildkite/pipeline.py | buildkite-agent pipeline upload