[HUDI-9395][DNM] Remove FG reader flag Usage

[linliu-code]

Change Logs

Remove the FG reader flag usage to see if any functionalities would fail.

Impact

No impact.

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

None.

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:

• d50e73d9062e9187ba7aa7430be4cf8c909cadb6 Azure: FAILURE

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build