Performance Issues with ReleasesController and subgroups
### Summary When querying releases (for example, the release filter in the group issue search) if a group has a large number of subgroups performance can be out of our expectations. ### Steps to reproduce Query the releases endpoint on any group with a large number of subgroups (i.e. GET /groups/<group_id>/-/releases) ### Relevant logs and/or screenshots <!-- Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's tough to read otherwise. -->
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