Move CtsContentTestCases to group presubmit-large

The test config takes longer than 900 seconds to run. Move it to a
dedicated group for running slow presubmit Test Mapping test.

Some more context is in the referenced bug, e.g, b/174495337
The group will work exactly the same as presubmit for now.

Bug: 174654670
Bug: 174495337
Test: treehugger
Change-Id: Id9769bbc625b42257af603d69098ae69c0fabb80