[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/varnotnull/boundInitializerWrong.kt

@@ -6,7 +6,7 @@ fun foo() {
     val y = x
     x = null
     if (y != null) {
-        <!OI;DEBUG_INFO_CONSTANT!>x<!><!UNSAFE_CALL!>.<!>hashCode()
+        <!DEBUG_INFO_CONSTANT{OI}!>x<!><!UNSAFE_CALL!>.<!>hashCode()
     }
 }
 
@@ -23,7 +23,7 @@ fun bar(s: String?) {
     val hashCode = ss?.hashCode()
     ss = null
     if (hashCode != null) {
-        <!OI;DEBUG_INFO_CONSTANT!>ss<!><!UNSAFE_CALL!>.<!>hashCode()
+        <!DEBUG_INFO_CONSTANT{OI}!>ss<!><!UNSAFE_CALL!>.<!>hashCode()
     }
 }