refactor: migrate existing Groovy tests to Kotlin, remove Groovy compiler from the build pipeline

[vlsi]

Description

Groovy-based tests are somewhat uneasy to maintain as the language is too dynamic for "find usages", "navigate to implementation" to work.

At the same time, Spock/Groovy have issues with support of recent Java (see #6114)

The major part is only a mechanical work, however, there are interesting cases:

ThroughputControllerTest

Groovy-based test lacks structure, and it is hard to tell what is going on.

    def createLoopController(int innerLoops) {
        LoopController innerLoop = new LoopController()
        innerLoop.setLoops(innerLoops)
        innerLoop.addTestElement(new TestSampler("zero"))
        innerLoop.addTestElement(sut)
        innerLoop.addIterationListener(sut)
        innerLoop.addTestElement(new TestSampler("three"))

        def outerLoop = new LoopController()
        outerLoop.setLoops(1)
        outerLoop.addTestElement(innerLoop)
        sut.testStarted()
        outerLoop.setRunningVersion(true)
        sut.setRunningVersion(true)
        innerLoop.setRunningVersion(true)
        outerLoop.initialize()
        outerLoop
    }

The same data is much easier to understand in Kotlin:

    private fun createLoopController(innerLoops: Int): LoopController {
        sut.testStarted()
        val tree = testTree {
            LoopController::class {
                loops = 1
                LoopController::class {
                    loops = innerLoops
                    +TestSampler("zero")
                    +sut
                    +TestSampler("three")
                }
            }
        }
        val compiler = TestCompiler(tree)
        tree.traverse(compiler)

        val outerLoop = tree.list().first() as LoopController
        outerLoop.initialize()

        sut.isRunningVersion = true
        sut.testStarted()

        return outerLoop
    }

[vlsi]

For reference, after this PR, ./gradlew -PjdkBuildVersion=23 -PtargetJavaVersion=17 test pass. In other words the PR resolves #6114