While looking at the '[raw]' value of a std::vector I noticed we didn't
handle the anonymous inner struct very well. The 'evaluateName' was
incorrect (e.g. the evaluateName would return `<var>.` for the anonymous
struct).
This improves support for variables with anonymous fields and anonymous
types.
* Changed the name of anonymous fields from `<null>` to `(anonymous)`,
which matches other tooling like clangd's representation and how types
are presented if the field is not defined.
* Adjusts variables to not return an 'evaluateName' for anonymous
fields.
* Adjusted '[raw]' values to be marked as 'internal' which deemphasizes
them in the UI.
While working in this area, I also consolidated some helpers that are
only used within Variables.cpp.
Before my changes:
<img width="513" height="460" alt="before"
src="https://github.com/user-attachments/assets/3da0aada-8ba3-415d-bbec-56b41a9b9415"
/>
After my changes:
<img width="414" height="467" alt="after"
src="https://github.com/user-attachments/assets/66a47108-ee44-4e01-8eab-e89edb348fde"
/>
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