Autoinsert '${}' for attribute <g:if test="${}"

And other attributes which are always used with '${}'

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*Imported from [IDEA-79217](https://youtrack.jetbrains.com/issue/IDEA-79217) · Type: Feature · Votes: 0*
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Start by locating the Grails tag attribute completion or insertion logic in the plugin; no file or test is named in the issue. Identify how the g:if test attribute is handled and which other attributes consistently use '${}'. Done means those attributes insert the expression wrapper automatically without changing unrelated attribute behavior.

Written by the indexing model from the issue text.