[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/imports/PackageVsClass.txt

@@ -24,7 +24,6 @@ package a {
     }
 }
 
-
 // -- Module: <m2> --
 package
 
@@ -48,7 +47,6 @@ package a {
     }
 }
 
-
 // -- Module: <m3> --
 package
 
@@ -60,7 +58,6 @@ package a {
     public fun test2(/*0*/ ab_c: a.b.c): kotlin.Unit
 }
 
-
 // -- Module: <m4> --
 package
 
@@ -71,3 +68,4 @@ package a {
     public fun test(/*0*/ a_b: a.b): kotlin.Unit
     public fun test2(/*0*/ ab_c: a.b.c): kotlin.Unit
 }
+