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perf(exports): cache results of attachment xpaths in protected property of Asset model DEV-706 (#5925)

### 📣 Summary
Speed up and improve the performance of both sync and async exports

### 📖 Description
This PR introduces a performance optimization for exports by caching the
results of attachment xpaths computation in a protected property on the
Asset model instance.

Previously, the same logic was computed repeatedly, under certain
circumstances, during export processes (both sync and async) , leading
to redundant work and slower execution.

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