[MINOR] unused method in HoodieColumnProjectionUtils removed

[xuzifu666]

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[xuzifu666]

@hudi-bot run azure

[hudi-bot]

CI report:

• 60e07ec Azure: FAILURE Azure: SUCCESS

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

[xuzifu666]

@yanghua have a review plz, thanks!

[yihua]

LGTM. Thanks for the cleanup.