EC containers differ in handling of raw virtual OID HEAD

[roman-khimov]

Expected Behavior

Same as for REP containers, currently it's returning SplitInfo with link ID.

Current Behavior

EC containers don't return that.

Possible Solution

Unify the behavior.

Steps to Reproduce (for bugs)

https://github.com/nspcc-dev/neofs-testcases/blob/62bd6b46b5c241103183413e6f9c3afb779f397d/pytest_tests/lib/helpers/complex_object_actions.py#L134-L149

Context

nspcc-dev/neofs-testcases#1222 (comment)

Regression

Not exactly, EC specifics.

Your Environment

• Version used: 0.50.2
• Server setup and configuration: testcases
• Operating System and version (uname -a):

[roman-khimov]

#3724 is more common.