IR text tests: Don't dump signatures for local declarations

1. Local declarations don't participate in IR-linkage, because they
can be referenced only inside the same body -> can be dropped
from IR text tests.

2. Mangled names for private declarations computed by descriptors/fir
are actually not used anywhere (they are recomputed by IR
immediately before serialization of IR). But sometimes such
mangled names diverge between K1 and K2 -> don't check them, but
always check mangled names computed by IR even for private
declarations.

3. Also: Drop DUMP_LOCAL_DECLARATION_SIGNATURES test directive.

^KT-57428 Obsolete
^KT-57430 Obsolete
^KT-57434 Obsolete
^KT-57778 Obsolete
^KT-57775 Obsolete

compiler/testData/ir/irText/declarations/annotations/genericAnnotationClasses.kt

@@ -1,5 +1,5 @@
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
-// ^ KT-60136
+// MUTE_SIGNATURE_COMPARISON_K2: JVM_IR JS_IR NATIVE
+// ^ KT-63724: all signatures match, but @Test5 has different value parameters structure
 
 package ann