FIR IDE: run FIR highlighting test on all test data

Similarly to FIR diagnostic tests. This commit enable all available test
data and check the reported error messages by FIR. This helps identify
some issues in formatting of FIR diagnostics.

The changes on the test file are mechanically generated. Failed tests
are disabled with `// IGNORE_FIR` and are re-enabled in the second
commit.

idea/testData/checker/MultipleModality.fir.kt

@@ -0,0 +1,9 @@
+sealed <error descr="[REDUNDANT_MODIFIER] Modifier 'abstract' is redundant because 'sealed' is present">abstract</error> class First
+
+<error descr="[REDUNDANT_MODIFIER] Modifier 'abstract' is redundant because 'sealed' is present">abstract</error> sealed class Second
+
+abstract class Base {
+    abstract <error descr="[REDUNDANT_MODIFIER] Modifier 'open' is redundant because 'abstract' is present">open</error> fun foo()
+
+    <error descr="[REDUNDANT_MODIFIER] Modifier 'open' is redundant because 'abstract' is present">open</error> abstract val name: String
+}