Apply review feedback: fix class descriptor derivation and annotation string constant relocation

[Copilot]

Addresses two review comments from the Class-File API migration PR.

• ShadowCopyAction.kt: Derive the remapping target from classModel.thisClass().asSymbol() instead of reconstructing ClassDesc from the JAR entry path. Prevents incorrect remapping for mispackaged inputs where the class's internal name diverges from its entry path.

• RelocatorRemapper.kt: AnnotationValue.OfConstant was returned unchanged, so string values in annotations were silently skipped during relocation. Now checks AnnotationValue.OfString and runs the string through map(str, mapLiterals = true), which correctly honors each relocator's skipStringConstants flag.

  // Before: returned unchanged, "foo.Bar" would not be relocated
  is AnnotationValue.OfConstant -> valObj
  
  // After: string annotation values are remapped like other string constants
  is AnnotationValue.OfConstant -> {
    if (valObj is AnnotationValue.OfString) {
      val str = valObj.stringValue()
      val mapped = map(str, mapLiterals = true)
      if (mapped != str) AnnotationValue.ofString(mapped) else valObj
    } else valObj
  }

• RelocationTest.kt: Added relocateAnnotationStringConstants regression test verifying that a runtime-retained annotation value "foo.Bar" is remapped to "shadow.foo.Bar" in the shadowed jar.

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• CHANGELOG's "Unreleased" section has been updated, if applicable.

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