[Test] Migrate FIR diagnostic spec tests to new infrastructure

This commit includes a lot of minor changes in testdata: new infrastructure
  requires that each test file in one testdata file in one module must
  have unique name, but a lot of existing spec tests didn't satisfy
  this requirement

compiler/tests-spec/build.gradle.kts

@@ -5,6 +5,11 @@ plugins {
 
 dependencies {
     testCompile(projectTests(":compiler"))
+    testImplementation(projectTests(":compiler:test-infrastructure"))
+    testImplementation(projectTests(":compiler:tests-common-new"))
+    testRuntimeOnly(platform("org.junit:junit-bom:5.7.0"))
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter")
+
     testCompileOnly(intellijDep()) {
         includeJars("groovy", "groovy-xml", rootProject = rootProject)
     }