Use MillisInstant by default when Python JdbcIO is used

[Abacn]

Resolve https://stackoverflow.com/questions/77317904/apache-beam-python-sdk-reading-from-postgres-using-jdbc-io

Some context:

This has been a long-standing issue. MillisInstant is a logical type that backs Java's DATETIME type in schema (in Java side, its language type is a Joda Instant). In Beam portable framework, DATETIME is no longer a primitive type (true for Python, Go but not for Java), but rather a logical type backed by a MicrosInstant. Its language type is a Java.time.Instant (due to joda is in maintenance mode and there is plan to replace to java.time.Instant.

This would be a breaking change and milestoned at next major version). As such, Java SDK still uses DATETIME primitive in schema. MillisInstant logical type was then a workaround introduced, to enable Python xlang JdbcIO to r/w rows contain Timestamps. But it need to register the MillisInstant to overwrite the default mapping (MicrosInstant) --- That is what currently the integration does.

Since this has been a pain point. It may worth to include this line in the jdbc module. It will then make the MillisInstant supersedes MicrosInstant when jdbc module is imported.

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[Abacn]

Run Python 3.11 PostCommit

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[Abacn]

many row coder unit test failing e.g. apache_beam.coders.row_coder_test.RowCoderTest.test_batch_encode_decode I now remember this was the reason I could not set MillisInstant as default in #22561

(although all post commit passed which means jdbcio indeed no longer this workaround to work with Timestamp)

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