Merge branch 'release-5.1.0' of https://github.com/Sunbird-Ed/SunbirdEd-portal into release-5.1.0

* 'release-5.1.0' of https://github.com/Sunbird-Ed/SunbirdEd-portal:
  Issue #SB-0000 fix: Added testcases for config and popup-control services
  Issue #ED-384 CSS cleanup and themes cleanup & SASS migration
  Issue #SB-0000 fix: Added testcases for cs-lib-initializer service
  Issue #SB-0000 fix: Added testcases for recover-account component and service