[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/MultiFilePackageRedeclaration.fir.kt

@@ -1,7 +1,7 @@
-// FILE: f.kt
+// FILE: a.kt
 package a
 class b {}
-// FILE: f.kt
+// FILE: b.kt
+package a.b
+// FILE: c.kt
 package a.b
-// FILE: f.kt
-package a.b