OPP: Enable/disable only necessary activities in tests

When running OPP activity related tests, the tests enabled/disabled
unnecessary activities including which should always be enabled.

As a result, device could not send a file via Bluetooth until reboot
since BluetoothOppLauncherActivity was disabled after any of those
tests.

This CL makes only nessceary activities be enabled/disabled during
the tests.

Bug: 324185238
Test: atest BluetoothOppBtEnableActivityTest \
            BluetoothOppBtEnablingActivityTest \
            BluetoothOppLauncherActivityTest \
            BluetoothOppReceiverTest \
            BluetoothOppTransferActivityTest \
            BluetoothOppTransferHistoryTest \
            BluetoothOppUtilityTest \
            IncomingFileConfirmActivityTest
Change-Id: If2930858d122ee20b8ebf5c1c381018182478f93