[improve][broker] Enhance compatibility with consumer replicate subscription state

[nodece]

Motivation:

• Previous Behavior: Replication subscription snapshot started if the consumer's replication subscription state was true.
• Issue: With [feat][broker] PIP-398: Subscription replication on the namespace and topic levels #29, the replication subscription stops if the consumer's replication state is false, which breaks the previous rule.
• Goal: Enhance compatibility by ensuring that the broker can still apply replication configuration based on topic or namespace-level settings when the consumer's replication state is false.

This pull request reverts the changes introduced in PR #29 that altered the public API.

Modifications:

1. Topic-Level Configuration:

   • When the consumer's replication subscription state is false, but a topic-level setting is present and true, the broker will use that topic-level configuration.

2. Namespace-Level Configuration:

   • If the consumer’s replication subscription state is false and there is no topic-level setting, but the namespace-level setting is present and true, the broker will apply the namespace-level configuration.

Documentation

• doc
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• doc-not-needed
• doc-complete