Fix flaky tests JoinMapperNewSyntaxTest

[bee0511]

What changed

Similar to #981.
Replaced containsExactly(...) with containsOnly(...) to avoid assuming deterministic field order in rows/Maps.

Why

The test failed intermittently because Map iteration order is not guaranteed. NonDex exposed this by randomizing iteration order.

How to reproduce

Run the test repeatedly with NonDex:

mvn -pl . edu.illinois:nondex-maven-plugin:2.1.7:nondex -Dtest=examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest -Drat.skip

You will see failures like:

[ERROR] Tests run: 21, Failures: 8, Errors: 0, Skipped: 0, Time elapsed: 1.274 s <<< FAILURE! -- in examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest
[ERROR] examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testRightJoinWithAliases -- Time elapsed: 0.222 s <<< FAILURE!
java.lang.AssertionError: 

Actual and expected have the same elements but not in the same order, at index 1 actual element was:
  "ITEM_ID"=44
whereas expected element was:
  "QUANTITY"=1

	at examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testRightJoinWithAliases(JoinMapperNewSyntaxTest.kt:598)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

How tested

Verified with the same NonDex runs; no further order-related failures occurred.

Tests fixed

examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testFullJoinWithoutAliases
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testLeftJoinWithAliases
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testLeftJoinWithoutAliases
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testLeftJoinWithSubQuery
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testRightJoinWithAliases
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testRightJoinWithoutAliases
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testRightJoinWithSubQuery
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testSelf
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testSelfWithNewAlias
examples.kotlin.mybatis3.joins.JoinMapperNewSyntaxTest.testSelfWithNewAliasAndOverride

[jeffgbutler]

Thanks!