Import releases from Gitea
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=499608) </details> <!--IssueSummary end--> ### Context Right now, the Gitea importer does not attempt to import releases [citing](https://gitlab.com/gitlab-org/gitlab/-/blob/488474-combined-ultimate-duo-ent-trial-widget/lib/gitlab/legacy_github_import/importer.rb?blame=0#L63) an [issue on Gitea](https://github.com/go-gitea/gitea/issues/330) that has since been completed. Gitea has now had an API for releases since 2017. ### Proposed Solution Remove [the logic that skips `import_releases` for gitea imports](https://gitlab.com/gitlab-org/gitlab/-/blob/488474-combined-ultimate-duo-ent-trial-widget/lib/gitlab/legacy_github_import/importer.rb?blame=0#L68), verify and make any changes necessary to support Gitea's API, and update specs to reflect Gitea's API response.
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