[HUDI-8427] Fix delete in file group reader and re-enable test in TestHoodieSparkMergeOnReadTableInsertUpdateDelete

[jonvex]

Change Logs

since it is using eventtime based merging, we need to actually set a real field for the precombine. Also need to convert the precombine to hive type when we read the hoodie records from log blocks

Impact

fix test, and also support precombine field types

Risk level (write none, low medium or high below)

low

Documentation Update

N/A

Contributor's checklist

• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• 441b8abc6b24a5e5075533a4c73a5367358c1495 Azure: SUCCESS

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