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: I275aa53a5102f00123f2429c22f31d8212b83377
Change-Id: I275aa53a5102f00123f2429c22f31d8212b83377