[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/assignment.kt

@@ -5,7 +5,7 @@ fun foo() {
     v = "abc"
     <!DEBUG_INFO_SMARTCAST!>v<!>.length
     v = null
-    <!OI;DEBUG_INFO_CONSTANT!>v<!><!UNSAFE_CALL!>.<!>length
+    <!DEBUG_INFO_CONSTANT{OI}!>v<!><!UNSAFE_CALL!>.<!>length
     v = "abc"
     <!DEBUG_INFO_SMARTCAST!>v<!>.length
-}
+}