Drop setting progressive mode in cli / cli-base (related to KT-59171)

This commit prevents language version increase due to bootstrapping
problems. Compiler version X attempts to build the project with the
current version X+1 -> warning about progressive mode cannot be enabled ->
error due to -Werror -> build failure.

compiler/cli/cli-base/build.gradle.kts

@@ -36,12 +36,6 @@ allprojects {
     optInToExperimentalCompilerApi()
 }
 
-tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile> {
-    compilerOptions {
-        progressiveMode.set(true)
-    }
-}
-
 testsJar {}
 
 projectTest {