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This is no longer an actual option since #7564 since we can technically launch a cluster without pickle but we cannot do anything with it.
I decided to remove the option entirely. If a user is actually setting it, we are now raising an exception during start to notify the user. I decided to go down this path since this option was used for security and I prefer failing hard than letting users think a security feature was still in place.
Sincere apologies for not going through a proper deprecation cycle but I think that ship has sailed. This has already be released in 2023.4.0
Closes #8386