feat: Use v2 of the Datadog Profiler stack.

It seems like the newer version might be more efficient,
so we should switch to using it.

edx/edx-arch-experiments#749

Author: dianakhuang

playbooks/roles/edxapp/templates/edx/app/edxapp/cms.sh.j2

@@ -29,6 +29,7 @@ export DD_DJANGO_INSTRUMENT_MIDDLEWARE=false
 # We want to be able to toggle this on separately from DD in general.
 {% if EDXAPP_DATADOG_PROFILING_ENABLE %}
 export DD_PROFILING_ENABLED=true
+export DD_PROFILING_STACK_V2_ENABLED=true
 {% endif -%}
 
 export PORT="{{ edxapp_cms_gunicorn_port }}"

playbooks/roles/edxapp/templates/edx/app/edxapp/lms.sh.j2

@@ -30,6 +30,7 @@ export DD_DJANGO_INSTRUMENT_MIDDLEWARE=false
 # We want to be able to toggle this on separately from DD in general.
 {% if EDXAPP_DATADOG_PROFILING_ENABLE %}
 export DD_PROFILING_ENABLED=true
+export DD_PROFILING_STACK_V2_ENABLED=true
 {% endif -%}
 
 export PORT="{{ edxapp_lms_gunicorn_port }}"