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box: fix schema upgrade replication

Commit 97c2c9a4fb58 ("box: disable DDL with old schema") added a check
to the on-replace trigger installed on all system spaces that fails the
operation if the schema version is outdated unless it's recovery time or
the operation was issued by the fiber performing a schema upgrade.

This new check breaks the replication use case:

 1. Tarantool binary is updated on all instances to a version that
    requires a newer schema - OK.
 2. box.schema.upgrade() is called on the master instance - OK.
 3. Operations performed by the master to upgrade the schema are
    replicated to the replicas - FAIL.

To fix this issue, let's bypass the schema version check for applier
fibers.

Follow-up #7149
Closes #9048

NO_DOC=bug fix
NO_CHANGELOG=unreleased

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