Move apex_rollback_tests 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 tests.

Bug: 174654670
Bug: 174495337
Bug: 175150979

Change-Id: Ie1a002551f400584ad8f2ffdfce0ff2bf2383760
Merged-In: Ie1a002551f400584ad8f2ffdfce0ff2bf2383760
Test: None
1 file changed