[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/overload/kt2493.fir.kt

@@ -17,4 +17,4 @@ fun main() {
     AImpl().f()
     BImpl().f()
     C().<!AMBIGUITY!>f<!>()
-}
+}

compiler/testData/diagnostics/tests/overload/kt2493.kt

@@ -16,5 +16,5 @@ class C: A, B
 fun main() {
     AImpl().f()
     BImpl().f()
-    C().<!NI;OVERLOAD_RESOLUTION_AMBIGUITY, OI;CANNOT_COMPLETE_RESOLVE!>f<!>()
-}
+    C().<!CANNOT_COMPLETE_RESOLVE{OI}, OVERLOAD_RESOLUTION_AMBIGUITY{NI}!>f<!>()
+}