[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/resolveWithStdlib/j+k/JavaGetPrefixConflict.fir.txt

@@ -0,0 +1,8 @@
+FILE: Test.kt
+    public final fun test(): R|kotlin/Unit| {
+        lval jc: R|JavaClass| = R|/JavaClass.JavaClass|()
+        lval result: R|ft<@FlexibleNullability kotlin/String, kotlin/String?>!| = R|<local>/jc|.R|/JavaClass.text|
+    }
+    public final fun otherTest(jc: R|JavaClass|): R|kotlin/Unit| {
+        lval result: R|ft<@FlexibleNullability kotlin/String, kotlin/String?>!| = R|<local>/jc|.R|/JavaClass.text|
+    }