[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/NoGenericsUnrelated.fir.kt

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -WARNING +CAST_NEVER_SUCCEEDS
+// !DIAGNOSTICS: -UNCHECKED_CAST
 interface Trait1
 interface Trait2
 open class OClass1
@@ -31,4 +31,4 @@ fun <TP1: OClass1, TP2: OClass2> test(
   tp1 as OClass2
   tp1 as FClass2
   tp1 as TP2
-}
+}