[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/fir/analysis-tests/testData/resolve/overrides/simple.kt

@@ -9,7 +9,7 @@ open class A {
 class B : A() {
     override fun foo(): B = this
     fun bar(): B = this // Ambiguity, no override here (really it's just "missing override" and no ambiguity)
-    override fun buz(p: B): B = this //No override as B <!:> A
+    override fun buz(p: B): B = this //No override as B not :> A
 
     fun test() {
         foo()