Delegate methods to v2 approval rules behind ff

Gavin Hinfeyrequested to merge
v2_approval_wrapped_rules_method_delegation into master

What does this MR do and why?

Adds delegation methods to the ApprovalWrappedRule class for v2 approval rules.

These are required by MergeRequests::ApprovalRulePolicy. def_delegators exists already in the approval_wrapped_rule class, but I have added these in separate methods as they should only be available behind a FF.

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Edited by Gavin Hinfey

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