[TD] Update diagnostics test data due to new test runners

Update includes:
- Changing syntax of `OI/`NI` tags from `<!NI;TAG!>` to `<!TAG{NI}!>`
- Fix some incorrect directives
- Change order of diagnostics in some places
- Remove ignored diagnostics from FIR test data (previously `DIAGNOSTICS` didn't work)
- Update FIR dumps in some places and add `FIR_IDENTICAL` if needed
- Replace all JAVAC_SKIP with SKIP_JAVAC directive

compiler/testData/diagnostics/tests/cast/neverSucceeds/MappedDirect.kt

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -WARNING +CAST_NEVER_SUCCEEDS
+// !DIAGNOSTICS: -PLATFORM_CLASS_MAPPED_TO_KOTLIN -USELESS_CAST
 import java.lang.String as JString
 import java.lang.CharSequence as JCS
 
@@ -30,4 +30,4 @@ fun test(
 
   jcs <!CAST_NEVER_SUCCEEDS!>as<!> Int
   s <!CAST_NEVER_SUCCEEDS!>as<!> java.lang.Integer
-}
+}