[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/when/ExhaustiveWithNullabilityCheckElse.fir.kt

@@ -1,3 +1,14 @@
+/*
+ * KOTLIN DIAGNOSTICS SPEC TEST (POSITIVE)
+ *
+ * SPEC VERSION: 0.1-152
+ * PRIMARY LINKS: expressions, when-expression -> paragraph 5 -> sentence 1
+ * expressions, when-expression, exhaustive-when-expressions -> paragraph 2 -> sentence 9
+ * type-inference, smart-casts, smart-cast-types -> paragraph 9 -> sentence 1
+ * control--and-data-flow-analysis, control-flow-graph, expressions-1, conditional-expressions -> paragraph 1 -> sentence 1
+ * control--and-data-flow-analysis, control-flow-graph, expressions-1, boolean-operators -> paragraph 0 -> sentence 0
+ */
+
 // KT-7857: when exhaustiveness does not take previous nullability checks into account
 enum class X { A, B }
 fun foo(arg: X?): Int {
@@ -11,4 +22,4 @@ fun foo(arg: X?): Int {
             // else or null branch should not be required here!
         }
     } 
-}
+}