Replace deprecated operator-> with . on podio collection references

[Copilot]

Podio removed the deprecated operator->() on collection objects in AIDASoft/podio#812. This PR updates juggler to use . instead of -> when accessing methods on collection references.

Changes

• FarForwardParticles.cpp: rc->push_back() → rc.push_back()
• FarForwardParticlesOMD.cpp: rc->push_back() → rc.push_back()

Context

The issue only affects collection references, not pointers:

// Reference pattern (FIXED) - was using deprecated operator->()
auto& rc = *(m_outputParticles.createAndPut());
rc.push_back(rpTrack);  // ✓ correct

// Pointer pattern (unchanged) - uses built-in pointer dereference
auto* ptr = m_outputCollection.createAndPut();
ptr->push_back(item);  // ✓ correct, not affected

Other files in the repository use the pointer pattern and require no changes.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Juggler uses dereference operator-> on podio collections</issue_title>
<issue_description>The current code in juggler uses operator-> on podio collections, which was removed in AIDASoft/podio#812. We should replace instances of -> with . on collections.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Juggler uses dereference operator-> on podio collections #6

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