chore: Make cran-* branch much more short-lived

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[aviator-app[bot]]

This pull request failed to merge: some CI status(es) failed. Remove the blocked label to re-queue.

Failed CI(s): Smoke test: stock R

[krlmlr]

New attempt in #794, with a rationale.

[aviator-app[bot]]

This pull request failed to merge: PR has a blocked label, remove to re-queue. After you have resolved the problem, you should remove the blocked pull request label from this PR and then try to re-queue the PR. Note that the pull request will be automatically re-queued if it has the mergequeue label.

[krlmlr]

Want to pick up the good bits from here.

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This pull request can't be queued because it's currently a draft.