[PTS-bot] Add PTS-bot configuration for MTS

Currently duplicates PTS-bot TF config. A single config should
be used in the future: http://b/242257925.

Test: mts-tradefed run mts -m pts-bot-mts
Bug: 242205000
Change-Id: I80ca1509b9a9f884c7c741df70d4a75982d238f1