fix(plugin-meetings): streamline rtpRecovered mqe

[edvujic]

COMPLETES SPARK-537027

This pull request addresses

The rtpRecovered MQE incorrectly reports a default value of "0", failing to reflect the actual number of RTP packets recovered by FEC during an interval.

The metric should accurately count and report the number of lost RTP packets that FEC recovers.

https://confluence-eng-gpk2.cisco.com/conf/display/webexmedia/MQE+Metrics+Tables

Change Type

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update
• [ ] Tooling change
• [ ] Internal code refactor

The following scenarios where tested

• Verifies no RTP recovered packets are present initially.
• Confirms RTP recovered packets match FEC packets received.
• Ensures accurate RTP recovered packet count after discards.
• Checks RTP recovered packets reset to zero after intervals.

I certified that

• [X] I have read and followed contributing guidelines

• [X] I discussed changes with code owners prior to submitting this pull request

• [X] I have not skipped any automated checks

• [X] All existing and new tests passed

• [ ] I have updated the documentation accordingly

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