DO NOT MERGE Update references to backup/restore agent timeouts

With the newly created Global setting for backup/restore agent timeouts
(backup_agent_timeout_parameters introduced in ag/3731401), update
references in backup and restore code to get the timeout values from
the setting instead of referencing constants in BMS.
This makes these timeouts configurable outside of the framework.

The default value of the setting is the same as the constants in BMS so
this should have no change on the timeout values used in the backup and
restore flow.

Bug: 70276070
Test: 1) m -j RunFrameworksServicesRoboTests
Change-Id: I0259bba76d0fed48158b8316f430b315ea98086e