Add integration tests for transaction APIs

[CTTY]

Is your feature request related to a problem or challenge?

Now many APIs in transaction/mod.rs don't have an integration tests to test if they actually work after committing the transaction. We can probably create a new test to test these APIs using a memory catalog

Describe the solution you'd like

No response

Willingness to contribute

I would be willing to contribute to this feature with guidance from the Iceberg Rust community

[github-actions[bot]]

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[liurenjie1024]

Missing feature