[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/kt2865.kt

@@ -7,6 +7,6 @@ fun foo(a: MutableMap<String, String>, x: String?) {
 }
 
 fun foo1(a: MutableMap<String, String>, x: String?) {
-    <!OI;TYPE_INFERENCE_CONFLICTING_SUBSTITUTIONS!>a[<!NI;TYPE_MISMATCH!>x<!>]<!> = x!!
+    <!TYPE_INFERENCE_CONFLICTING_SUBSTITUTIONS{OI}!>a[<!TYPE_MISMATCH{NI}!>x<!>]<!> = x!!
     a[x<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>] = <!DEBUG_INFO_SMARTCAST!>x<!>
-}
+}