APItest/t/utf8_warn_base: Add tests #22646
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One UTF-8 malformation is when the string has a start byte in it before the expected end of the character. This test file tested the case where the unexpected byte came in the final position. GH #22597 found bugs where the undexpected byte came immediately after the first byte.
This commit adds tests for unexpected bytes in all possible positions. if the fix for GH #22597 is reverted, this new revised file has 1400 failures.