[HUDI-9476] Update test usage of createNewInstantTime

[the-other-tim-brown]

Change Logs

• Update the test code for creating new instant times to use a specific test utility before further code cleanup. This allows us to limit the number of main codepaths that are creating instant times to ensure they are created in a uniform way.

Impact

• Cleanup existing code

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
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• a68aa781b47a09a8e9445eadf9928e0e2c47bbb7 Azure: SUCCESS

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