Remove Insights feedback email setting

Remove setting `INSIGHTS_FEEDBACK_EMAIL`, as it was deemed redundant with `INSIGHTS_SUPPORT_EMAIL`

AUTHORS

@@ -56,3 +56,4 @@ Shohei Maeda <s.maeda@gacco.co.jp>
 Bill DeRusha <bill@edx.org>
 Jillian Vogel <jill@opencraft.com>
 Zubair Afzal <zubair.afzal@arbisoft.com>
+Kyle McCormick <kylemccor@gmail.com>

CHANGELOG.md

@@ -260,3 +260,6 @@
 
 - Role: edxapp
   - Added `EDXAPP_BLOCK_STRUCTURES_SETTINGS` to configure S3-backed Course Block Structures.
+
+- Role: insights
+  - Removed `INSIGHTS_FEEDBACK_EMAIL` which is no longer used, as it was deemed redundant with `INSIGHTS_SUPPORT_EMAIL`.

playbooks/roles/insights/defaults/main.yml

@@ -15,7 +15,6 @@ INSIGHTS_LMS_BASE: 'http://127.0.0.1:8000'
 INSIGHTS_CMS_BASE: 'http://127.0.0.1:8010'
 INSIGHTS_BASE_URL: 'http://127.0.0.1:8110'
 INSIGHTS_MEMCACHE: [ '127.0.0.1:11211' ]
-INSIGHTS_FEEDBACK_EMAIL: 'dashboard@example.com'
 INSIGHTS_MKTG_BASE: 'http://example.com'
 INSIGHTS_LOGOUT_URL: '{{ INSIGHTS_MKTG_BASE }}/accounts/logout/'
 INSIGHTS_PRIVACY_POLICY_URL: '{{ INSIGHTS_MKTG_BASE }}/privacy-policy'
@@ -92,7 +91,6 @@ INSIGHTS_CONFIG:
   DOCUMENTATION_LOAD_ERROR_URL: '{{ INSIGHTS_DOC_BASE }}/Reference.html#error-conditions'
   SEGMENT_IO_KEY: '{{ INSIGHTS_SEGMENT_IO_KEY }}'
   SEGMENT_IGNORE_EMAIL_REGEX: '{{ INSIGHTS_SEGMENT_IGNORE_EMAIL_REGEX }}'
-  FEEDBACK_EMAIL: '{{ INSIGHTS_FEEDBACK_EMAIL }}'
   PRIVACY_POLICY_URL: '{{ INSIGHTS_PRIVACY_POLICY_URL }}'
   TERMS_OF_SERVICE_URL: '{{ INSIGHTS_TERMS_OF_SERVICE_URL }}'
   HELP_URL: '{{ INSIGHTS_DOC_BASE }}'