DAOS-16386 utils: Add DDB Feature and RM_POOL Support (#15062)

[wangshilong]

This PR enhances the DDB functionality for CR purposes with the following updates:

1. Pool Behavior Control:

Administrators can now control certain vos pool behaviors, such as skipping vos pool loading or setting a vos pool to immutable mode.

2. Manual Pool Shard Removal:

A new command ddb rm_pool <vos_pool> has been introduced, allowing administrators to manually remove pool shards.

3. SPDK Environment Initialization Bug Fix:

Fixed an issue where spdk_env_init() would fail during reinitialization.

These updates aim to improve system flexibility and stability, providing administrators with more robust management capabilities.

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[github-actions]

Ticket title is 'Enhance DDB for CR purpose'
Status is 'Awaiting backport'
Labels: 'request_for_2.6.2'
https://daosio.atlassian.net/browse/DAOS-16386