Fix for nar unpacking

[nikhilerigila09]

Fixes apache#23273

Main Issue: apache#23273

Motivation

This PR addresses an issue where the Pulsar broker fails to restart due to incomplete NAR file extraction. The broker attempts to reuse an incomplete directory in the /tmp folder, leading to a NoSuchFileException. This occurs when the broker is stopped during the extraction process, causing the NAR files to remain in an inconsistent state, which affects future restarts.

Modifications

• Implemented a ".success" file that is written after a NAR file is fully extracted.

• On broker restart, the existence of the ".success" file is checked to ensure the NAR directory is valid. If the file is missing, the extraction process is restarted.

Verifying this change

• Make sure that the change passes the CI checks.

If the box was checked, please highlight the changes

• 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