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: Icbffaf8d2a507f519eb2fda34106a359f1bddaf4