[improve][broker] backlog quota exceed limit log replaced with debug

[mukesh154]

Fixes #22474
Already fixed on branch-3.1: #22475

Motivation

Currently, when backlog quota limit exceeded and producers still send messages, it generates lot of logs in short period of time. The logs are logged with info. We can use debug instead of info.

Modifications

• Replaced the info with debug for logs when the backlog quota limit exceeded.

Verifying this change

This change is a rework/code-cleanup without any test coverage.

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

• Dependencies (does it add or upgrade a dependency): no
• The public API: no
• The schema: no
• The default values of configurations: no
• The wire protocol: no
• The rest endpoints: no
• The admin cli options: no
• Anything that affects deployment: no

Documentation

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