[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/callableReference/function/ambiguityTopLevelVsTopLevel.kt

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -UNUSED_EXPRESSION,-UNUSED_VARIABLE
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_VARIABLE
 fun foo(x: Int, <!UNUSED_PARAMETER!>y<!>: Any) = x
 fun foo(<!UNUSED_PARAMETER!>x<!>: Any, y: Int) = y