[Bug]: Jenkins release pipeline fails when not publishing docs

[collinss-jpl]

Checked for duplicates

Yes - I've already checked

Describe the bug

The PGE release pipeline in Jenkins current reports failure when run with the "Publish docs" option deselected. This is because by default the pipeline will attempt to delete the conda environment we create to install sphinx, but this environment is only created when "Publish docs" is enabled. All deployment steps prior to cleanup succeed though, so this bug is more of a nuisance than any kind of blocker.

What did you expect?

When the deployment pipeline is running the cleanup phase, it should take into account the setting of the PUBLISH_DOCS Jenkins variable and only conditionally attempt to delete the sphinx conda env.

Reproducible steps

Run the release pipeline for any PGE with the "Publish docs" option deselected (Note: remember to cleanup any docker images pushed to Artifactory after testing!)

Environment

- Version of this software [e.g. vX.Y.Z]
- Operating System: [e.g. MacOSX with Docker Desktop vX.Y]
...