Remove obsolete test file and update remaining tests to not use the
removed --resolve-collisions flag. Hash-based IDs make collision
resolution unnecessary.
Changes:
- Delete internal/rpc/server_autoimport_test.go (obsolete)
- Remove --resolve-collisions from beads_nway_test.go
- Remove --resolve-collisions from beads_twoclone_test.go
- Remove --resolve-collisions from cmd/bd/sync.go
All tests now pass.