[improve] [broker] Enable AppendBrokerTimestampMetadataInterceptor by default

[315157973]

Main Issue: #21347

Motivation

When the client machine's clock is incorrect (eg: set to 1 year later) and the Broker does not set the AppendBrokerTimestampMetadataInterceptor, the Ledger will not be cleaned up. Because if the Broker's timestamp is not set, the expiration check will be based on the client's publish time.

As we discuss in https://lists.apache.org/thread/0vtjt436xvlg0fr4ogchkjdvjcp56mvz

Modifications

Enable AppendBrokerTimestampMetadataInterceptor by default

Verifying this change

• [x] Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

• [x] The default values of configurations

• [x] doc-not-needed

Matching PR in forked repository

PR in forked repository: https://github.com/315157973/pulsar/pull/13

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