[HUDI-9673] Remove event_time metadata support from DefaultHoodieRecordPayload

[linliu-code]

Change Logs

Since event_time is populated in HoodieWriteHandle, there is no need to duplicate the logic in DefaultHoodieRecordPayload. So far, event_time is the only payload that supports event_time metadata.
Therefore, we remove the support from DefaultHoodieRecordPayload now.

Impact

No duplicated support for event_time from DefaultHoodieRecordPayload.

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

Low.

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change. If not, put "none".

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the
  ticket number here and follow the instruction to make
  changes to the website.

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:

• 594413e UNKNOWN
• 7b75f6d Azure: SUCCESS

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