pattern: only log disabling origins once

Getting this message on every page is needlessly verbose, especially in staging where most listers are configured this way.

assigned to @olasd

Jenkins job DLS/gitlab-builds #462 succeeded in 3 min 22 sec.
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added 3 commits

• ce955fba...41c13438 - 2 commits from branch swh/devel:master
• 5f713504 - pattern: only log disabling origins once

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Jenkins job DLS/gitlab-builds #472 succeeded in 3 min 38 sec.
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