GRD: fix searchable option building
GRD: fix searchable option building

It was broken by implementation of `mergePluginJarTask` because it was supposed that `mergePluginJarTask` is executed right after `prepareSandbox`. But actually, it may be executed after other tasks which depend on `prepareSandbox` themselves

This change introduce a small hack to force desired order

Undin/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,intellij-rust/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,Undin/intellij-rust,Undin/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,intellij-rust/intellij-rust,intellij-rust/intellij-rust