Do not mock shim in TcpSocketTrackerTest

Instead of mocking the shim, the test needs to run only on platforms
that support the feature, and can provide test versions of the
underlying objects (here Network).

Also move the SDK version check to TcpSocketTracker itself, as users of
TcpSocketTracker should not be able to set isTcpInfoParsingSupported to
true on Q.

Bug: 143586229
Test: atest NetworkStackTests NetworkStackNextTests on Q and R

Change-Id: I580ae9ded468d3f08da336b160596484938bf2a5
Merged-In: I580ae9ded468d3f08da336b160596484938bf2a5
(cherry picked from commit 3ad1d5f0)