Update DynamicConfigPusher to possibly fetch from resources

- Export DynamicConfig.xml for BUILD_COMPATIBLITY_TEST
inside the harness jar.
- Allow DynamicConfigPusher to use it from here.

Test: make cts, gts
check cts-tradefed.jar and gts-tradefed.jar contains their
respective dynamic config.
run cts-unit-tests
run cts -m CtsGesture
Bug: 70777117

Change-Id: I9fd8226e9de4ff12a3fddf7773efbf54bc16a409
6 files changed