[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/generics/nullability/tpInBounds.fir.kt

@@ -1,5 +1,5 @@
 // !WITH_NEW_INFERENCE
-// !DIAGNOSTICS: -UNUSED_VALUE,-UNUSED_VARIABLE,-ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE,-VARIABLE_WITH_REDUNDANT_INITIALIZER
+// !DIAGNOSTICS: -UNUSED_VALUE -UNUSED_VARIABLE -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -VARIABLE_WITH_REDUNDANT_INITIALIZER
 
 class A<T : CharSequence?, E1 : T, E2: T?> {
     fun T.bar() {}