[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/cast/UselessSafeCast.kt

@@ -11,7 +11,7 @@ fun test(x: Int?) {
     val a7: Number? = 1 <!USELESS_CAST!>as? Number<!>
 
     run { x <!USELESS_CAST!>as? Int<!> }
-    run { x <!NI;USELESS_CAST!>as? Number<!> }
+    run { x <!USELESS_CAST{NI}!>as? Number<!> }
 
     foo(x as? Number)
 
@@ -20,4 +20,4 @@ fun test(x: Int?) {
     }
 }
 
-fun foo(x: Number?) {}
+fun foo(x: Number?) {}