Add auto test in gradle (light tree)

Additionally removed benchmarks from auto test because they require manual setting.
Instruction was also added.

build.gradle.kts

@@ -503,6 +503,7 @@ tasks {
         dependsOn(":compiler:fir:psi2fir:test")
         dependsOn(":compiler:fir:resolve:test")
         dependsOn(":compiler:fir:fir2ir:test")
+        dependsOn(":compiler:fir:lightTree:test")
     }
 
     create("scriptingTest") {

compiler/fir/lightTree/build.gradle.kts

@@ -37,6 +37,7 @@ sourceSets {
 
 projectTest {
     workingDir = rootDir
+    exclude("**/benchmark/**")
 }
 
 val compactClasspath by tasks.creating(Jar::class) {

compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/AbstractBenchmark.kt

@@ -14,6 +14,13 @@ import org.openjdk.jmh.annotations.*
 import java.io.File
 import java.util.concurrent.TimeUnit
 
+/**
+ * This class is base for all benchmarks.
+ *
+ * To run benchmarks use gradle and consistently run next tasks:
+ * 1. jmhBytecode
+ * 2. jmhExec
+ */
 @BenchmarkMode(Mode.SingleShotTime)
 @Warmup(iterations = 10, batchSize = 1)
 @Measurement(iterations = 10, batchSize = 1)