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: Ib9d7b86ea9bee438383a80a66b5d1c008565ba10
Test: none