Set Release Name When Adding Release Notes to an Existing Tag

What does this MR do?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58418 : "Adding release notes to created tag doesn't display tag name"

Existing Behavior

If a user adds release notes to an existing tag that previously did not have release notes, then a new release is created. However, the release's sha, author_id, and name are not set. Not setting name resulted in the bug described in #58418 (closed).

Behavior After This MR

If a user adds release notes to an existing tag that previously did not have release notes, then a new release is created and the sha, author_id, and name are set.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer