Fix wrong checkpoint info after restart #7801
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What problem does this PR solve?
Issue Number: close #7799
Problem Summary: After disable uploading page data when do checkpoint, the data file id in manifest will be empty. And after restart, tiflash may try to recover from the latest manifest file and set a empty checkpoint location which is unexpected and will make tiflash crash in the next round of uploading checkpoint.
What is changed and how it works?
When restoring from manifest file at restart, check whether the data file id is empty before copy the checkpoint info to memory.
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