libfuzzer based fuzzer's aren't covering all code paths

[Alan-Jowett]

1. Launch execution context fuzzer under debugger.
2. Place breakpoints on all protocol handler functions.
3. As each function is hit, remove that breakpoint.

Expected result:
All protocol handles should be hit at least once.

Actual result:
The following were never hit:

execution_context_fuzzer!_ebpf_core_protocol_map_update_element_with_handle
execution_context_fuzzer!_ebpf_core_protocol_ring_buffer_map_query_buffer
execution_context_fuzzer!_ebpf_core_protocol_create_program
execution_context_fuzzer!_ebpf_core_protocol_load_code
execution_context_fuzzer!_ebpf_core_protocol_map_get_next_key_value_batch
execution_context_fuzzer!_ebpf_core_protocol_get_pinned_object
execution_context_fuzzer!_ebpf_core_protocol_get_pinned_map_info
execution_context_fuzzer!_ebpf_core_protocol_create_map
execution_context_fuzzer!_ebpf_core_protocol_get_program_handle_by_id
execution_context_fuzzer!_ebpf_core_protocol_link_program
execution_context_fuzzer!_ebpf_core_protocol_close_handle
execution_context_fuzzer!_ebpf_core_protocol_map_delete_element
execution_context_fuzzer!_ebpf_core_protocol_map_update_element
execution_context_fuzzer!_ebpf_core_protocol_convert_pinning_entries_to_map_info_array
execution_context_fuzzer!_ebpf_core_protocol_get_link_handle_by_id
execution_context_fuzzer!_ebpf_core_protocol_unlink_program
execution_context_fuzzer!_ebpf_core_protocol_get_map_handle_by_id
execution_context_fuzzer!_ebpf_core_protocol_map_update_element_batch
execution_context_fuzzer!_ebpf_core_protocol_map_delete_element_batch
execution_context_fuzzer!_ebpf_core_protocol_load_native_module
execution_context_fuzzer!_ebpf_core_protocol_serialize_map_info_reply
execution_context_fuzzer!_ebpf_core_protocol_bind_map
execution_context_fuzzer!_ebpf_core_protocol_get_ec_function

[shankarseal]

Since libfuzzer sets the reply buffer size to random value, it misses all the protocol messages that require a specific size.