ci: ignore missing files when creating archive

[daniel-weisse]

Context

During our e2e tests, we have a pre-configured list of files we plan to upload. If some of these files don't exist, our artifact upload action fails, and we never upload an archive. This can happen if the CLI fails during creation of the infrastructure, and then fails to clean up said infrastructure. In this case, no constellation-mastersecret.json was ever created and the archive creation fails. This causes problems for the clean-up action of the upgrade test.

Proposed change(s)

• Only add files to the archive if they actually exist
• Reduce noise of archive creation and extraction

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