Replace issuableTypes object with TYPE_EPIC constant

Coung Ngorequested to merge
cngo-replace-issuableTypes into master

What does this MR do and why?

This MR replaces the issuableTypes object in favour of the primitive TYPE_EPIC constant, in line with our FE guidelines. Follow-up to !111967 (merged)

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

Edited by Coung Ngo

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