refactor: Misc. clean up from dashboard investigation

There are some refactors to use an existing variable and also
some removals for code paths that would never execute

lms/templates/dashboard.html

@@ -21,11 +21,6 @@ from openedx.core.djangolib.markup import HTML, Text
 from common.djangoapps.student.models import CourseEnrollment
 %>
 
-<%
-  cert_name_short = settings.CERT_NAME_SHORT
-  cert_name_long = settings.CERT_NAME_LONG
-%>
-
 
 <%block name="pagetitle">${_("Dashboard")}</%block>
 <%block name="bodyclass">view-dashboard is-authenticated</%block>
@@ -113,12 +108,6 @@ from common.djangoapps.student.models import CourseEnrollment
 
 <div class="dashboard-notifications" tabindex="-1">
 
-    %if banner_account_activation_message:
-        <div class="dashboard-banner">
-            ${banner_account_activation_message | n, decode.utf8}
-        </div>
-    %endif
-
     %if enrollment_message:
         <div class="dashboard-banner">
             ${enrollment_message | n,  decode.utf8}

lms/templates/dashboard/_dashboard_course_listing.html

@@ -33,9 +33,6 @@ from lms.djangoapps.experiments.utils import UPSELL_TRACKING_FLAG
 
 <%
   reverify_link = IDVerificationService.get_verify_location()
-  cert_name_short = course_overview.cert_name_short
-  if cert_name_short == "":
-    cert_name_short = settings.CERT_NAME_SHORT
 
   cert_name_long = course_overview.cert_name_long
   if cert_name_long == "":
@@ -60,8 +57,6 @@ from lms.djangoapps.experiments.utils import UPSELL_TRACKING_FLAG
             verification_status.get('status'),
             course_overview.id
         )
-    %>
-    <%
         mode_class = course_verified_certs.get('display_mode', '')
         if mode_class:
             mode_class = ' ' + mode_class ;
@@ -309,7 +304,7 @@ from lms.djangoapps.experiments.utils import UPSELL_TRACKING_FLAG
                   % endif
 
                 % else:
-                  <%include file="_dashboard_course_resume.html" args="resume_button_url=resume_button_url, course_overview=course_overview, enrollment=enrollment, is_unfulfilled_entitlement=is_unfulfilled_entitlement, course_target=course_target, related_programs=related_programs"/>
+                  <%include file="_dashboard_course_resume.html" args="resume_button_url=resume_button_url, course_overview=course_overview, enrollment=enrollment, is_unfulfilled_entitlement=is_unfulfilled_entitlement, course_target=course_target"/>
                 % endif
               % endif
           </div>

lms/templates/dashboard/_dashboard_course_resume.html

@@ -1,4 +1,4 @@
-<%page args="resume_button_url, course_overview, enrollment, is_unfulfilled_entitlement, course_target, related_programs" expression_filter="h"/>
+<%page args="resume_button_url, course_overview, enrollment, is_unfulfilled_entitlement, course_target" expression_filter="h"/>
 
 <%!
 import six