[25.3] Add rpk cluster connections list examples

[kbatuigas]

Description

This pull request updates Redpanda documentation to highlight and demonstrate the use of the rpk cluster connections list command for monitoring Kafka client connections, in addition to the existing Admin API method. The changes add practical examples, command usage tabs, and improve clarity for users on how to identify and troubleshoot client connections using both CLI and API approaches.

Enhancements to client connection monitoring documentation:

• Added references and examples for using the rpk cluster connections list command alongside the Admin API ListKafkaConnections endpoint throughout the documentation, making it easier for users to monitor client connections via CLI or API. [1] [2] [3]

• Introduced tabbed code examples showing both rpk and curl usage for listing, filtering, and sorting Kafka client connections, including sample command outputs and improved formatting for clarity. [1] [2] [3] [4] [5]

Improvements to example responses and formatting:

• Updated example API responses to be collapsible and more concise, replacing long inlined JSON with expandable sections and ellipses to focus on relevant details. [1] [2] [3] [4]

• Enhanced filtering and sorting instructions for identifying high-throughput clients, including practical filter examples and output samples for both CLI and API methods. [1] [2]

Resolves https://redpandadata.atlassian.net/browse/
Review deadline: 31 Oct

Page previews

Manage Throughput > View connected client details
Monitor Redpanda > Identify high-throughput clients
Configure Client Connections

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch DOC-1726-document-feature-rpk-commands-for-active-client-m

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[Feediver1]

lgtm
In Configure Client connections, there is a Tip that includes connect in bold surrounded by periods--please take a look, as this does not look correct. Fix here if you can. Thx