Mark "Ravenwood-tests" and "robo-test" modules as being TestOnly and...

Mark "Ravenwood-tests" and "robo-test" modules as being TestOnly and top-level-tests for code coverage reporting.

Fixes: 402451184
Tests: m nothing --no-skip-soong-tests blueprint_tests
Tests: go test ./java
Tests: m all_teams && gqui from  "flatten(out/soong/ownership/all_teams.pb, teams)" proto build/soong/android/team_proto/team.proto:AllTeams 'select teams.kind, count(*) where teams.test_only = true and teams.kind not like "%cc_%" group by teams.kind'

+--------------------------+----------+
|        teams.kind        | count(*) |
+--------------------------+----------+
| android_ravenwood_test   |       37 |
| android_robolectric_test |      118 |
| android_test             |     2230 |
| android_test_helper_app  |     2125 |
...

Change-Id: Ib81b6d261a3088aed44ea4d74452f99ff0f3d587