[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/cfg/emptyWhen.fir.txt

@@ -0,0 +1,16 @@
+FILE: emptyWhen.kt
+    public final fun test_1(): R|kotlin/Unit| {
+        when () {
+        }
+
+    }
+    public final fun test_2(x: R|kotlin/Int|): R|kotlin/Unit| {
+        when (R|<local>/x|) {
+        }
+
+    }
+    public final fun test_3(x: R|kotlin/Int|): R|kotlin/Unit| {
+        when (lval y: R|kotlin/Int| = R|<local>/x|) {
+        }
+
+    }