ITCommitTimestampTest.invalidColumnOptionValue check very specific error message

[skuruppu]

The Spanner team reported that checking for specific error strings are error-prone as the returned string can change without notice.

I think they're specifically referring to this line:

java-spanner/google-cloud-spanner/src/test/java/com/google/cloud/spanner/it/ITCommitTimestampTest.java

Line 192 in 5806b0e

expectedException.expectMessage("Errors parsing Spanner DDL statement");

If this can be fixed, that would be great.