Drop plugins dir support

Dmytro Zaporozhets (DZ)requested to merge
dz-drop-plugins-dir into master

What does this MR do?

Drop plugins dir support that was deprecated in 13.0. Now only file_hooks dir is supported for executing file hooks.

For #196846 (closed)

Does this MR meet the acceptance criteria?

Conformity

Edited by Dmytro Zaporozhets (DZ)

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