[Backend] Suggest available Jira issues when editing a Merge Request title or description

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Problem to solve

As part of &7542 we need a way to suggest available Jira tickets that will be used by the frontend in #352497.

Proposal

Add an endpoint to get the integrated Jira project's code(s), for example JRE.

Add an endpoint to get the matching Jira ticket number and titles for a piece of text, for example JRE-11 would return the tickets JRE-110 and JRE-111.

Design

Implementation

TODO: backend engineer to add implementation plan 🚧