Only interpret vars wrapped in braces

[dadgar]

Only interpret vars wrapped in braces: $node.class -> ${node.class}

[VladRassokhin]

BTW: Maybe it's time to use HIL? :)

[VladRassokhin]

It's good news that almost all HCL based config files would use unified interpolations syntax, simplifies IDE support.

[VladRassokhin]

Seems first if statement in resolveConstraintTarget should check for prefix ${, not $

[github-actions]

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