[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/declarationChecks/illegalModifiersOnClass.fir.kt

@@ -3,10 +3,10 @@
 // KT-3464 Front-end shouldn't allow override modifier in class declaration
 
 override class A {
-    override companion <!REDECLARATION!>object<!> {}
-    open companion <!MANY_COMPANION_OBJECTS, REDECLARATION!>object<!> {}
-    abstract companion <!MANY_COMPANION_OBJECTS, REDECLARATION!>object<!> {}
-    final companion <!MANY_COMPANION_OBJECTS, REDECLARATION!>object<!> {}
+    override companion object {}
+    open companion object {}
+    abstract companion object {}
+    final companion object {}
 }
 
 override object B1 {}
@@ -16,4 +16,4 @@ final object B4 {}
 
 override enum class C {}
 override interface D {}
-override annotation class E
+override annotation class E