[RAG stack] Pipeline missing configuration for Cloud Object Storage Evidence Locker

[ocofaigh]

The following is seen in the code-ci-start stage of the CI pipeline:

Pipeline missing configuration for Cloud Object Storage Evidence Locker
Configure Cloud Object Storage as Evidence Locker in the pipeline
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After reviewing your pipeline properties, we noticed that the Cloud Object Storage (COS) bucket is not set up as the evidence locker in your pipeline. To ensure optimal performance, we intend to make the COS Evidence Locker mandatory in the future.
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https://cloud.ibm.com/docs/devsecops?topic=devsecops-cd-devsecops-cos-bucket-evidence

Due to this, the stage is marked as a failure: