Fix bug #69280: SoapClient classmap doesn't support fully qualified class name (#14398)

There's a hash table that maps type names to class name, but names with
a leading backslash are no

Fix bug #69280: SoapClient classmap doesn't support fully qualified class name (#14398)

There's a hash table that maps type names to class name, but names with
a leading backslash are not supported. The engine has logic to strip
away the leading backslash that we should replicate here.

It works by checking if we need to make an actual copy in case an
unexpected (e.g. invalid data or leading backslash) situations are
detected. Upon making a copy we normalize the data in the table.

Furthermore, previously the code assumed that the key was always valid
and that the structure was a non-packed hash table. This isn't
necessarily the case. The new code fixes this as well.

Closes GH-14398.

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