[feat][broker] Add custom topic metric labels to OpenTelemetry metrics

[coderzc]

Main Issue: N/A

PIP: https://github.com/apache/pulsar/blob/master/pip/pip-447.md

Motivation

This PR is part 2 of PIP-447.

Part 1 for Prometheus labels has already been merged in apache#24991. This follow-up extends the same custom topic metric label support to OpenTelemetry topic metrics so both metrics pipelines expose the same topic property based labels.

Modifications

• add custom topic metric labels to OpenTelemetry topic metrics for persistent topics
• extend PersistentTopicAttributes to build OpenTelemetry attributes with custom labels
• update OpenTelemetry topic stats recording to attach custom labels across topic metrics
• add broker tests for custom labels in OpenTelemetry metrics
• fix the renamed config setter in the test after rebasing on latest master

Verifying this change

• Make sure that the change passes the CI checks.

This change added tests and can be verified as follows:

• Ran mvn clean install -DskipTests
• Added OpenTelemetryCustomLabelsTest to verify custom labels are exposed in OpenTelemetry metrics and omitted when the feature is disabled

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

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: N/A