fix: stabilize Kotlin, Scala, and Rust runtime tests

[Varadraj75]

Description

This PR stabilizes the Kotlin, Scala, and Rust runtime tests which were failing in clean local environments and inside Docker/CI.

It fixes multiple root causes, including:

• Enforcing Java 17 for Gradle-based runtime tests
• Fixing missing or incorrect code generation before builds
• Correcting Scala enum rendering issues
• Removing hardcoded cargo path in Rust runtime tests
• Updating Gradle wrapper configuration to avoid class file version errors

After these changes, all runtime tests pass consistently both locally and in Docker.

Related Issue

Closes: #2414

Checklist

• The code follows the project's coding standards and is properly linted (npm run lint).
• Tests have been added or updated to cover the changes.
• Documentation has been updated to reflect the changes.
• All tests pass successfully locally.(npm run test).

Additional Notes

This PR was tested on macOS with Node v24 and Java 17.

The following commands now pass successfully:

npm run test:runtime:kotlin
npm run test:runtime:scala
npm run test:runtime:rust
npm test

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[Copilot]

Pull request overview

This PR stabilizes Kotlin, Scala, and Rust runtime tests by fixing multiple issues that prevented them from running consistently in clean environments and CI/CD pipelines.

Changes:

• Fixed import paths in runtime test generators to use correct module references
• Upgraded Gradle wrapper to version 8.5 for better Java 17 compatibility
• Added code generation steps before build/test execution in Kotlin and Scala tests
• Enhanced Scala enum type handling to properly reference enum values
• Made Rust tests more flexible with configurable cargo path
• Updated test timeouts and added stderr tolerance for noisy build outputs

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/runtime/runtime-scala/src/test/scala/com/mycompany/app/generic/AddressSpec.scala	Updated test data to match generated code structure with correct types and optional enum fields
test/runtime/runtime-scala.ts	Fixed import path from '../..' to '../../src' for proper module resolution
test/runtime/runtime-scala.spec.ts	Added code generation step, increased timeout, and enabled stderr output
test/runtime/runtime-rust/Cargo.toml	Removed unnecessary bin and test configurations for library project
test/runtime/runtime-rust.spec.ts	Added configurable cargo path via environment variable and enabled stderr output
test/runtime/runtime-kotlin/src/test/kotlin/com/mycompany/app/generic/AddressTest.kt	Updated test to use correct types and standalone NestedObject class, added missing import
test/runtime/runtime-kotlin/gradle/wrapper/gradle-wrapper.properties	Upgraded Gradle from 4.4.1 to 8.5 for Java 17 support
test/runtime/runtime-kotlin/build.gradle	Added Jackson and Hamcrest dependencies required by tests
test/runtime/runtime-kotlin.ts	Fixed import path from '../../' to '../../src' for proper module resolution
test/runtime/runtime-kotlin.spec.ts	Added code generation step, increased timeout, and enabled stderr output
src/generators/scala/ScalaConstrainer.ts	Enhanced Reference type mapping to handle enum references by appending '.Value'
Dockerfile	Removed deprecated apt-key commands for mono installation

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[coveralls]

Pull Request Test Coverage Report for Build 21139599147

Details

• 3 of 4 (75.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 90.997%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/generators/scala/ScalaConstrainer.ts	2	3	66.67%

Files with Coverage Reduction	New Missed Lines	%
src/generators/rust/RustConstrainer.ts	1	94.38%

Totals
Change from base Build 21131896077:	-0.03%
Covered Lines:	6942
Relevant Lines:	7421

---

💛 - Coveralls

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud