Flaky Test: `ConverterAwareMappingSpannerEntityReaderTests.readUnmatachableTypesTest()`

[pem70]

Description

This test readUnmatachableTypesTest() fails intermittently because it asserts the exact exception message ("...: id").
The underlying reader processes entity fields in a non-deterministic order (e.g., reflection order), so the first field that triggers the exception can change between runs.
As a result, the message may not always end with : id, causing flaky test failures even though the exception type is correct.

How to Reproduce

Run the test with the NonDex plugin to randomize iteration order:

mvn -pl spring-cloud-gcp-data-spanner edu.illinois:nondex-maven-plugin:2.1.7:nondex -Dtest=ConverterAwareMappingSpannerEntityReaderTests#readUnmatachableTypesTest

Additional

I have a fix ready for this test, and I can make the PR if permitted.
Also, there is a typo in the test name.

[pem70]

I have a PR that fixes this issue: #4187