Remove Praefect-generated replica paths feature flag

Sami Hiltunenrequested to merge
smh-remove-path-flag into master

Praefect-generated replica paths have been enabled by default since 15.3 without issues, so this commit removes the feature flag and related code.

Documentation: gitlab!102375 (merged)
Related: #4218 (closed)

Edited by Sami Hiltunen

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