[MINOR] Fix flaky tests in ITTestHoodieDataSource caused by unordered hashmap

[trushev]

This PR fixes flaky tests in ITTestHoodieDataSource.
Tests sometimes are failed because they do the check hashMap1.toString().equals(hashMap2.toString()) while hashmap does not guarantee that the order of entries will remain constant over time

Change Logs

Replaced the check hashMap1.toString().equals(hashMap2.toString()) with hashMap1.equals(hashMap2)

Impact

Fixed testParquetComplexTypes and testParquetComplexNestedRowTypes failed with assertion

java.lang.AssertionError: 
Expected: is "[+I[1, [abc1, def1], {abc1=1, def1=3}, +I[1, abc1]], +I[2, [abc2, def2], {def2=3, abc2=1}, +I[2, abc2]], +I[3, [abc3, def3], {def3=3, abc3=1}, +I[3, abc3]]]"
     but: was "[+I[1, [abc1, def1], {def1=3, abc1=1}, +I[1, abc1]], +I[2, [abc2, def2], {def2=3, abc2=1}, +I[2, abc2]], +I[3, [abc3, def3], {def3=3, abc3=1}, +I[3, abc3]]]"

where {abc1=1, def1=3} != {def1=3, abc1=1}

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

• 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

[danny0405]

Can we move these utilities to TestData.java ?

[trushev]

Moved to TestData

[hudi-bot]

CI report:

• 5f2475c Azure: SUCCESS

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