[FSD2D]: Ignore eligiblity checks in BackupAgent

In case of device-to-device migration:
1. Include no-backup and cache dirs.
2. Ignore restore eligibility check for file paths.

Bug: 160407842
Test: 1. atest BackupAgentTest
      2. Manual: Verify that all files are backed up / restored for
      migrations.
Change-Id: I011c954c3e9e09828d2fb65fdfe96d8b6a6ba150