Completely detach old data stack

Not create DcTracker and TransportManager instances
when new data stack is enabled.

Test: atest FrameworksTelephonyTests and manually tested on
Pixel 4 and Pixel 6.
Bug: 222323544

Merged-In: Ice595f329e2f4e531dc577cd3db7c863ba15d6d6
Change-Id: Ice595f329e2f4e531dc577cd3db7c863ba15d6d6