[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/smartCasts/castchecks/variables.kt

@@ -41,7 +41,7 @@ fun f(a: SomeClass?) {
     if (aa as? SomeSubClass != null) {
         aa = null
         // 'aa' cannot be cast to SomeSubClass
-        <!OI;DEBUG_INFO_CONSTANT!>aa<!><!UNSAFE_CALL!>.<!>hashCode()
+        <!DEBUG_INFO_CONSTANT{OI}!>aa<!><!UNSAFE_CALL!>.<!>hashCode()
         aa.<!UNRESOLVED_REFERENCE!>foo<!>
         (<!DEBUG_INFO_CONSTANT!>aa<!> as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
         (<!ALWAYS_NULL!>aa<!> as SomeSubClass).foo
@@ -50,7 +50,7 @@ fun f(a: SomeClass?) {
     aa = null
     if (b != null) {
         // 'aa' cannot be cast to SomeSubClass
-        <!OI;DEBUG_INFO_CONSTANT!>aa<!><!UNSAFE_CALL!>.<!>hashCode()
+        <!DEBUG_INFO_CONSTANT{OI}!>aa<!><!UNSAFE_CALL!>.<!>hashCode()
         aa.<!UNRESOLVED_REFERENCE!>foo<!>
         (<!DEBUG_INFO_CONSTANT!>aa<!> as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
         (<!ALWAYS_NULL!>aa<!> as SomeSubClass).foo
@@ -65,4 +65,4 @@ fun f(a: SomeClass?) {
         <!DEBUG_INFO_SMARTCAST!>c<!>.hashCode()
         <!DEBUG_INFO_SMARTCAST!>c<!>.foo
     }
-}
+}