[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/resolve/expresssions/simple.fir.txt

@@ -0,0 +1,10 @@
+FILE: simple.kt
+    public final fun foo(): R|kotlin/Unit| {
+        lval x: R|kotlin/Int| = Int(1)
+    }
+    public final val bar: R|kotlin/String| = String()
+        public get(): R|kotlin/String|
+    public final val n: R|kotlin/Nothing?| = Null(null)
+        public get(): R|kotlin/Nothing?|
+    public final val g: R|kotlin/String?| = Null(null)
+        public get(): R|kotlin/String?|