Minor: Use hasSameSizeAs to show more debug info

[aihuaxu]

Revert back to use hasSameSizeAs instead of isEqualTo in the test since when the number doesn't match, hasSameSizeAs will show the records for debug.

Actual and expected should have same size but actual size is:
  100
while expected size is:
  99
Actual was:
  [[-1853403699951111791,keys: [djhnOE!Q8EcmpHvCXKdCGT1bKPynyUGZ57,MJtC!VHkgou8p!H1!10?RdQBc1e69Os-F
TMEx7tg6cF4Kvk2D3PcPGZUspTDtS9wK?p!qqERhkj?DT3A=CottFHuHPVAGRPlOwVpSWdNbP})]
...
	at org.apache.iceberg.spark.source.DataFrameWriteTestBase.createDataset(DataFrameWriteTestBase.java:104)
	at org.apache.iceberg.spark.source.DataFrameWriteTestBase.writeRecords(DataFrameWriteTestBase.java:69)
	at org.apache.iceberg.spark.source.ScanTestBase.writeAndValidate(ScanTestBase.java:105)
	at org.apache.iceberg.spark.source.ScanTestBase.writeAndValidate(ScanTestBase.java:85)
	at org.apache.iceberg.spark.data.AvroDataTestBase.testMap(AvroDataTestBase.java:277)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

[aihuaxu]

@nastra I'm changing back to use hasSameSizeAs. Please take a look.

[dramaticlly]

nit, maybe can change title to "Spark 4.0: Use hasSameSizeAs in collection size assertion"

[nastra]

thanks for fixing this @aihuaxu