Incomplete OCP keyword deregistration functionality in OVOSCommonPlaybackSkill

[coderabbitai]

Problem

The deregister_ocp_keyword method in OVOSCommonPlaybackSkill is currently incomplete and does not properly remove entities from internal data structures (ocp_matchers and _ocp_ents). This could lead to memory leaks as entities accumulate without proper cleanup.

Current Behavior

The method currently only passes without removing entities:

• Entities remain in ocp_matchers dictionary
• Entities remain in _ocp_ents dictionary
• No local cleanup is performed

Expected Behavior

The method should properly clean up registered entities from internal data structures, even if upstream deregistration is not yet supported.

Context

This issue was identified during code review of PR #365.

References:

• PR: fix: ocp skills #365
• Comment: fix: ocp skills #365 (comment)
• Requested by: @JarbasAl