fix(rider): Restore rd-gen model generation for both 2025.x and 2026.1

[branrin]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Description

Commit 292181d removed hashFolder, classpath, and sources from the RdGenExtension config to accommodate rd-gen 2026.1 API changes, but this broke the 2025.x build and left 2026.1 model generation non-functional.

All the automated unit tests on Linux and Windows were failing with the message below

Execution failed for task ':plugin-toolkit:jetbrains-rider:compileKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
   > Compilation error. See log for more details

Fix
For pre-2026 profiles, restore the extension properties via reflection to avoid script compilation failures when the 2026.1 rd-gen jar is on the buildscript classpath.

For 2026.1+, add a compileModelSources task that pre-compiles model sources with an external Kotlin compiler, since rd-gen 2026.1 removed its built-in Kotlin compilation support.

Checklist

• My code follows the code style of this project
• I have added tests to cover my changes
• A short description of the change has been added to the CHANGELOG if the change is customer-facing in the IDE.
• I have added metrics for my changes (if required)

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

Qodana for JVM

It seems all right 👌

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[branrin]

This fixed the compileKotlin issue in all of the Linux and Windows builds. Now, Windows 2025.1 and 2025.2 fully passed, while the others were a mix of failures for Execution failed for task ':plugin-toolkit:jetbrains-rider:detekt' and Execution failed for task ':plugin-toolkit:jetbrains-core:test'. with the failing tests being from CloudFormationServiceNodeTest, possibly related to commit 566a023 ("feat(cloudformation): add try new CloudFormation node to Explorer").

Merging this since it fixes the main issue and will continue to iterate on resolving everything