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Show correct cost/phase of template-variants in structree whilst maintaining…

Description

Show correct cost/phase of template-variants in structree whilst maintaining correct build lists in viewer

("Variant" in this case means a template that is functionally the same as its
base template - but is a different promotion level, requires a technology to
unlock (that the base template doesn't), is an upgrade of its base, or is a
trainable version.)

Should fix concern raised on phab:rP23808.

Accepted by: Angen
Differential Revision: https://code.wildfiregames.com/D3347