Create sitewide-qa-plan

.github/ISSUE_TEMPLATE/sitewide-qa-plan

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+## Testing context
+
+Implementation ticket being tested: 
+Who wrote the changes:  
+
+### Testing environment 
+- [ ] Local. **WHY**: 
+- [ ] Review instance on a PR
+- [ ] Tugboat. **WHY**:
+- [ ] Staging behind a flipper. **WHY**: 
+
+### Scope of changes: high level
+
+
+### Affected components / what changed / what is new and should be tested
+
+
+### Gotchas / Exceptions
+
+
+## Acceptance Criteria / Ownership
+- [ ] Build a test plan from the [Test plan template](https://docs.google.com/spreadsheets/d/10qA57ATiFCi4Tju_TzWPQAkSSCbr7F2oXbXn_lEzuS4/edit#gid=0). Include: 
+   - [ ] 
+- [ ] Run test cases in the noted Testing environment
+    - [ ] Note failures in the spreadsheet and point to either a GH ticket or a Mural to demonstrate what you found
+- [ ] Accessibility review - Owner: 
+- [ ] Design review - Owner: 
+- [ ] Code review - Owner: 
+- [ ] Production UAT - Owner: