[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/redeclarations/Redeclarations.kt

@@ -1,4 +1,4 @@
-// FILE: f.kt
+// FILE: a.kt
 package redeclarations
   object <!PACKAGE_OR_CLASSIFIER_REDECLARATION, REDECLARATION!>A<!> {
     val x : Int = 0
@@ -10,6 +10,6 @@ package redeclarations
 
   val <!PACKAGE_OR_CLASSIFIER_REDECLARATION, REDECLARATION!>A<!> = 1
 
-// FILE: f.kt
+// FILE: b.kt
   package redeclarations.<!PACKAGE_OR_CLASSIFIER_REDECLARATION!>A<!>
     class A {}