[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/fir/analysis-tests/testData/resolveWithStdlib/arrayFirstOrNull.fir.txt

@@ -0,0 +1,20 @@
+FILE: arrayFirstOrNull.kt
+    public abstract interface G : R|kotlin/Any| {
+        public abstract val a: R|kotlin/Array<out G>|
+            public get(): R|kotlin/Array<out G>|
+
+    }
+    public final fun goo(g: R|G|): R|kotlin/Unit| {
+        lval x: R|G?| = R|<local>/g|.R|/G.a|.R|/firstOrNullX|<R|G|>()
+    }
+    public final fun <T> R|kotlin/Array<out T>|.firstOrNullX(): R|T?| {
+        ^firstOrNullX when () {
+            this@R|/firstOrNullX|.R|kotlin/collections/isEmpty|<R|T|>() ->  {
+                Null(null)
+            }
+            else ->  {
+                this@R|/firstOrNullX|.R|SubstitutionOverride<kotlin/Array.get: R|CapturedType(out T)|>|(Int(0))
+            }
+        }
+
+    }