Add 'Outcome Alignment Summary Tab' FF
Add 'Outcome Alignment Summary Tab' FF

closes OUT-5067
flag=outcome_alignment_summary

Test plan:
- Go to Account -> Settings -> Feature Options
- Verify that there is an Account level feature flag named
"Outcome Alignment Summary Tab" with description
"Provides a list of alignments for each outcome in a course."

Change-Id: I70a6c80fef63dfe12494dae9de807df5c9dd728f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/289781
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Fernando Marques <d66f2dbf610d1baf61284c1a16439cd42dd1ba49@instructure.com>
QA-Review: Chrystal Langston <d2663071bf6fe682e3f489a1b66462ff19cc17ab@instructure.com>
Product-Review: Ben Friedman <9ff7ab9178cb213f349bd6b616f1928aeccb5475@instructure.com>

instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms