Fix configuration merge for nodes with substitution attributes

[thevar1able]

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• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix unexpected configuration value concatenation in case of overriding an entry having a substitution (from_env/from_zk/incl) #56537

[robot-clickhouse]

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[azat]

I used this behavior before (define default value in the xml with replace attribute and from_env and override it via env) for development, AFAICS the bug that described in #56537 is fixed by removing SUBSTITUTION_ATTRS from source node during merging before?

[azat]

• Allow nodes in config with from_env/from_zk and non empty element with replace=1 #57628