Overide MR#approved? to include #temporarily_unapproved? state

What does this MR do and why?

As mentioned in #430112 (closed) - this refactors the approved? method in EE to include the "temporary approval" flag to make it a little cleaner.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #430112 (closed)

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