ICU-22753 Fix read-after-move in MF2

In StaticErrors::addError() and DynamicErrors::addError(),
don't read from `e` after moving out of it.

icu4c/source/i18n/messageformat2_errors.cpp

@@ -189,10 +189,12 @@ namespace message2 {
  void StaticErrors::addError(StaticError&& e, UErrorCode& status) {
  CHECK_ERROR(status);
 
+ StaticErrorType type = e.type;
+
  void* errorP = static_cast<void*>(create<StaticError>(std::move(e), status));
  U_ASSERT(syntaxAndDataModelErrors.isValid());
 
- switch (e.type) {
+ switch (type) {
  case StaticErrorType::SyntaxError: {
  syntaxError = true;
  break;
@@ -229,10 +231,12 @@ namespace message2 {
  void DynamicErrors::addError(DynamicError&& e, UErrorCode& status) {
  CHECK_ERROR(status);
 
+ DynamicErrorType type = e.type;
+
  void* errorP = static_cast<void*>(create<DynamicError>(std::move(e), status));
  U_ASSERT(resolutionAndFormattingErrors.isValid());
 
- switch (e.type) {
+ switch (type) {
  case DynamicErrorType::UnresolvedVariable: {
  unresolvedVariableError = true;
  resolutionAndFormattingErrors->adoptElement(errorP, status);