fix(ulp): Added unit tests for ulp binary embed with prefix and misc fixes

This commit:
- Removes the link time symbol name clash detection.
- Extracts symbols of type NOTYPE for global identifiers defined in
  assembly files.
- Makes the prefix argument optional for ulp_add_build_binary_targets().
- Adds a unit test for the ulp binary embed with a prefix feature.

docs/en/api-reference/system/ulp-lp-core.rst

@@ -50,7 +50,7 @@ If you need to embed multiple ULP programs, you may add a custom prefix in order
 
     ulp_embed_binary(${ulp_app_name} "${ulp_sources}" "${ulp_exp_dep_srcs}" PREFIX "ULP::")
 
-The additional argument can be a C style prefix (like ``ulp2_``) or a C++ style prefix (like ``ULP::``).
+The additional PREFIX argument can be a C style prefix (like ``ulp2_``) or a C++ style prefix (like ``ULP::``).
 
 Using a Custom CMake Project
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

docs/en/api-reference/system/ulp-risc-v.rst

@@ -53,7 +53,7 @@ If you need to embed multiple ULP programs, you may add a custom prefix in order
 
     ulp_embed_binary(${ulp_app_name} "${ulp_sources}" "${ulp_exp_dep_srcs}" PREFIX "ULP::")
 
-The additional argument can be a C style prefix (like ``ulp2_``) or a C++ style prefix (like ``ULP::``).
+The additional PREFIX argument can be a C style prefix (like ``ulp2_``) or a C++ style prefix (like ``ULP::``).
 
 Using a Custom CMake Project
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

docs/en/api-reference/system/ulp.rst

@@ -64,7 +64,7 @@ If you need to embed multiple ULP programs, you may add a custom prefix in order
 
     ulp_embed_binary(${ulp_app_name} "${ulp_sources}" "${ulp_exp_dep_srcs}" PREFIX "ULP::")
 
-The additional argument can be a C style prefix (like ``ulp2_``).
+The additional PREFIX argument can be a C style prefix (like ``ulp2_``) or a C++ style prefix (like ``ULP::``).
 
 3. Build the application as usual (e.g., ``idf.py app``).