[Wasm] Initial K2 support in new test infrastructure (KT-57230)

- Implement FirWasmSessionFactory
- Use new compiler test infra for Wasm K1 and K2
- Delete old Wasm compiler test infra

build.gradle.kts

@@ -672,7 +672,6 @@ tasks {
 
     register("wasmCompilerTest") {
         dependsOn(":wasm:wasm.tests:test")
-        dependsOn(":wasm:wasm.tests:diagnosticsTest")
         // Windows WABT release requires Visual C++ Redistributable
         if (!kotlinBuildProperties.isTeamcityBuild || !org.gradle.internal.os.OperatingSystem.current().isWindows) {
             dependsOn(":wasm:wasm.ir:test")