Planner: Do not allow cardinality to go below 1 | tidb-test=pr/2450#58173

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ti-chi-bot wants to merge 1 commit intopingcap:release-7.5from ti-chi-bot:cherry-pick-55242-to-release-7.5

+6,850-127

Commits on Dec 13, 2024

This is an automated cherry-pick of pingcap#55242

terry1purcell
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