TelecomManager consolidate isInSelfManagedCall.

As per API feedback, consolidate TelecomManager#isInSelfManagedCall into
a single API which only takes a UserHandle and disregard the
hasCrossUserAccess parameter. Instead, the caller can specify
UserHandle.ALL in order to indicate that self managed calls across all
users should be checked.

Bug: 327029478
Bug: 311773409
Test: atest SelfManagedConnectionServiceTest
Change-Id: I89552f9bf4c1fce0f2477715ef79a3d56eeae922