It seems Vue 2 is more eager to "prune" or not pass down slots than
@vue/compat or Vue 3.

The fix here is to only pass the `default` slot down if it's been
explicitly provided.

This is similar to the fix for GlDisclosureDropdown in
gitlab-org/gitlab-ui!4901.

fix(GlPopover): Render content prop when given

See merge request gitlab-org/gitlab-ui!4921



Merged-by: Peter Hegman <phegman@gitlab.com>
Approved-by: Peter Hegman <phegman@gitlab.com>
Reviewed-by: Mark Florian <mflorian@gitlab.com>
Co-authored-by: Mark Florian <mflorian@gitlab.com>

## [107.1.1](gitlab-org/gitlab-ui@v107.1.0...v107.1.1) (2025-01-17)

### Bug Fixes

* **GlPopover:** Render content prop when given ([55c98a16](gitlab-org/gitlab-ui@55c98a16))