ROX-31696, ROX-34943: Cleanup create-custom-snapshot tasks

[tommartensen]

See individual commits.

I will leave the instructions to allow pruning of the custom snapshots in the release doc (https://redhat.atlassian.net/wiki/spaces/StackRox/pages/309339008/Upstream+Konflux+Release#%5BinlineExtension%5DAllow-pruning-Konflux-snapshots), and set a reminder to 1 month from now to remove it. All release branches should have picked up the change by then.

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