Keep annotation map snapshots alive during regex updates

[LuuSir]

Base: Cosys-Lab/Cosys-AirSim:5.2.1 (09d8f992).

Six regex update loops create an iterator from GetNameToComponentMap(), which returns a TMap by value. That temporary is destroyed at the end of the for-loop initializer, leaving the iterator referring to a destroyed container. Keep a local map snapshot for the duration of each loop.

This patch changes lifetime only and preserves matching and update behavior. It covers instance segmentation, RGB index/color, greyscale and texture annotation update paths.

Validation

• Integrated into an isolated UE 5.2.1 BlocksEditor build with MSVC 14.34; compilation and linking pass.
• Instance segmentation regex updates exercised through RPC; other annotation modes have compile coverage only.

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