[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/inference/coercionToUnit/kt30242.kt

@@ -48,7 +48,7 @@ fun bar(block: () -> String) {}
 
 fun test_5(b: Boolean) {
     bar {
-        <!NI;TYPE_MISMATCH, TYPE_MISMATCH!>if (b) {
+        <!TYPE_MISMATCH{NI}, TYPE_MISMATCH!>if (b) {
             println("meh")
         }<!>
     }
@@ -61,4 +61,4 @@ fun test_6(b: Boolean) {
         }
         if (b) {}
     }
-}
+}