Prevent GattService modifying transitionalScanHelper lifecycle when not

in control if the flag is on.

See go/scan-manager-refactor for more details.

Bug: 313335632
Bug: 267361243
Bug: 327503826
Flag: EXEMPT, mechanical refactor
Test: m com.android.btservices
Change-Id: I62649d1783db0d1c3fc5d677e107e46e4834e6b0