Disable tests that depend on the prebuilt version in U

This should be reverted as soon as it is merged into U
and the build request is submitted.

Bug: 286649301
Test: NetworkAgentTest, TH
Change-Id: I2cbe990675b109e4ba744101dd7dbbb20229376f
Merged-In: I2cbe990675b109e4ba744101dd7dbbb20229376f