Allow SLES release jobs to fail to be non-blocking

Balasankar 'Balu' Crequested to merge
allow-sles-release-jobs-to-fail into master

What does this MR do?

Allow SLES release jobs to fail so that they don't block jobs in metrics stage.

Related issues

Closes: gitlab-com/gl-infra/delivery#1721 (closed)

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