[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/nullabilityAndSmartCasts/kt2216.kt

@@ -15,7 +15,7 @@ fun foo() {
 
     val y: Int? = 0
     val z: Int? = 0
-    bar(<!NI;TYPE_MISMATCH!>if (y != null) y else <!OI;TYPE_MISMATCH!>z<!><!>, <!TYPE_MISMATCH!>y<!>)
+    bar(<!TYPE_MISMATCH{NI}!>if (y != null) y else <!TYPE_MISMATCH{OI}!>z<!><!>, <!TYPE_MISMATCH!>y<!>)
     y <!UNSAFE_OPERATOR_CALL!>+<!> 2
     baz(<!TYPE_MISMATCH!>y<!>, <!TYPE_MISMATCH!>y<!>, if (y == null) return else y, y)
     baz(y, z!!, z, y)