Test Mapping: Update test-mapping-group post platinum split

Platinum test-mapping suite is set to be expanded to other areas under Ironwood efforts. Since sysui covers the biggest fraction of total tests in platinum, splitting it as a separate suite will help me reduce load on total runtime of the suite while onboarding new tests and maintaining readability for non-experts.

Bug: 239384214
Bug: 239426163
Change-Id: I0f57deb2af3a943fda34d0ecaafb644afc67152c
Merged-IN: I0f57deb2af3a943fda34d0ecaafb644afc67152c
(cherry picked from commit 65f3aad5)