[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/generics/nullability/smartCastsValueArgument.fir.kt

@@ -1,5 +1,5 @@
 // !WITH_NEW_INFERENCE
-// !DIAGNOSTICS: -UNUSED_EXPRESSION,-UNUSED_VARIABLE,-UNUSED_PARAMETER,-ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE,-UNUSED_VALUE
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_VARIABLE -UNUSED_PARAMETER -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -UNUSED_VALUE
 
 fun <T : CharSequence> bar1(x: T) {}
 fun bar2(x: CharSequence) {}