Move CtsMediaTestCases to group presubmit-large

The test config takes longer than 15mins to run. Move it to a dedicated
group for running slow presubmit Test Mapping test.

Bug: 174654670
Bug: 174495337
Bug: 175150979
Change-Id: Ib66e519b9087f9b4807eebda3d06575af0fe0e94
Test: none

Exempt-From-Owner-Approval: only move tests to different group
Change-Id: Ib66e519b9087f9b4807eebda3d06575af0fe0e94