[FIR] Drop visualizer module

This module was created to compare type resolve in K1 and K2. But
overall, these tests contain a lot of bugs, and it is quite hard
to use it.

build.gradle.kts

@@ -702,10 +702,6 @@ tasks {
         dependsOn(":compiler:fir:fir2ir:nightlyTests")
     }
 
-    register("compilerFrontendVisualizerTest") {
-        dependsOn("compiler:visualizer:test")
-    }
-
     register("scriptingJvmTest") {
         dependsOn("dist")
         dependsOn(":kotlin-scripting-compiler:test")