Add NetHttpCoverageTests to mainline presubmit

Mainline presubmit runs on older images. So we need to set:
- min_sdk_version to the minimum sdk we support otherwise
it would default to current
- enforce_default_target_sdk_version since mainline needs
all modules to target the latest sdk

Test: presubmit
Bug: 263294440
Change-Id: I20757b13ab9ab45908dae088c6cb6b0bbc51989d
7 files changed