[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/Nullability.kt

@@ -149,7 +149,7 @@ fun test() {
   
   while (out2 == null) {
     <!DEBUG_INFO_CONSTANT!>out2<!>?.println();
-    <!OI;DEBUG_INFO_CONSTANT!>out2<!><!UNSAFE_CALL!>.<!>println();
+    <!DEBUG_INFO_CONSTANT{OI}!>out2<!><!UNSAFE_CALL!>.<!>println();
   }
   <!DEBUG_INFO_SMARTCAST!>out2<!>.println()