feat: Remove dangerous function (#4007)

There is a method in the stdlib transcript that could easily confuse
developers in the future if we end up reusing/updating the old plonk
transcript. It's better to avoid this issue.

Co-authored-by: kevaundray <kevtheappdev@gmail.com>

Author: Rumata888

barretenberg/cpp/src/barretenberg/stdlib/recursion/transcript/transcript.hpp

@@ -360,13 +360,6 @@ template <typename Builder> class Transcript {
         return challenge_values[static_cast<size_t>(cache_idx)][static_cast<size_t>(challenge_idx)];
     }
 
-    barretenberg::g1::affine_element get_group_element(const std::string& element_name) const
-    {
-        barretenberg::g1::affine_element value =
-            barretenberg::g1::affine_element::serialize_from_buffer(&(transcript_base.get_element(element_name))[0]);
-        return value;
-    }
-
     group_pt get_circuit_group_element(const std::string& element_name) const
     {
         int cache_idx = check_group_element_cache(element_name);