fix: read Rfam GA cutoff from CM section so non-rRNA hits aren't dropped

[pmb59]

bin/parse_rfam_results.py — extract_rfam_metrics now tracks whether it's inside the INFERNAL covariance‑model section vs. the HMMER3 filter section, and only reads metrics from the CM section. Previously the GA‑less filter section overwrote each model's real GA cutoff, so downstream filtering dropped every non‑rRNA hit.

PR checklist

• This comment contains a description of changes (with reason).
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[nf-core-bot]

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