v3.4.9

Improvements

• feat(fixtures): add override test cases [#627] @themightychris
• feat(fixtures): Expand Calculations [#630, SCHOOL-134] @Camus1859
• fix: completion percentage on skills with no ER [#632, SCHOOL-56] @nbey
• fix(demos-teacher): revert use of getTotalDemonstrationsRequired in data context @themightychris

Technical

• chore(deps): bump slate to v2.17.1 @themightychris
• Enable disabled test [#603, SCHOOL-99] @Camus1859
• fix(e2e): add wait/assert for all XHR calls [#634, SCHOOL-144] @themightychris