Get rid of kotlinx-coroutines usage in scripting libs and plugins

the dependency on the coroutines library caused various problems like
KT-30778, or stdlib/runtime version conflicts.
The only function used was `runBlocking`, so this change replaces it
with the internal implementation based on the similar internal thing
from the stdlib.
#KT-30778 fixed

libraries/scripting/dependencies-maven/build.gradle.kts

@@ -33,6 +33,7 @@ dependencies {
     testImplementation(commonDep("junit"))
     testRuntimeOnly("org.slf4j:slf4j-nop:1.7.30")
     testImplementation(kotlin("reflect"))
+    testImplementation(commonDep("org.jetbrains.kotlinx", "kotlinx-coroutines-core"))
 }
 
 sourceSets {