[MINOR] TestPositionBasedFileGroupRecordBuffer setup fixes

[the-other-tim-brown]

Change Logs

The TestPositionBasedFileGroupRecordBuffer currently extends TestHoodieFileGroupReaderOnSpark which causes the tests in TestHoodieFileGroupReaderOnSpark to be run twice, increasing run time in CI. The PR avoids extending that class and instead extends SparkClientFunctionalTestHarness.

Impact

Avoids running tests twice

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

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

[hudi-bot]

CI report:

• 87a8d1f1dc0c8d95fad94aaa711032dbd5de0369 Azure: SUCCESS

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