This upgrade is needed in order to be able to upgrade the gateway/intellij
platform plugins.

This is needed in order to be able to specify "unlimited until builds".
IntelliJ Platform Gradle Plugin 2.x is the build system that supersedes
the Gradle IntelliJ Plugin 1.x, and this is the version that comes with
the ability to provide unlimited until build support.

This is a major overhaul of the DSL, I've tested these changes locally with
GW 2023.3 (the minimum supported version), and I've also compared the plugin.xml
with a previous version to make sure it is generated correctly.

Every time a new GW version is released we need to change the untilBuild setting.
With latest IntelliJ Platform Plugin we can provide unlimited upper range with no
manual intervention each time a new release is happening.

Use gateway DSL to provide the platform type and version.
The plugin verification as well as the platform type depends on the versions in the format "2025.x"