Docs: Add a section in LUA hooks explaining the required user permissions to execute them

[N-o-Z]

It is not clear - what are the implications of using LUA hooks with scripts on the ability of a user to perform an operation.
For example:
Say we configure a pre create branch LUA action that runs a certain script.
In addition we configure a user with permissions to create branch only (no read permission to objects)
In this scenario the user would not be able to create the branch since they will fail on the pre create branch hook due to permissions trying to read the script

[nopcoder]

@treeverse/product your input - do we need to enable hook execution regardless to the user's permissions? or document the required permissions based on the hook's operations.

[github-actions]

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[N-o-Z]

@talSofer @ozkatz