Fix incorrect ETag cache key when relative instance URL is used
What does this MR do?
Fixes incorrect cache key for ETag caching when instance uses a relative URL. In this case we have to take into account both
Does this MR meet the acceptance criteria?
- Changelog entry added, if necessary
[ ] Documentation created/updated [ ] API support added
- Added for this feature/bug
- All builds are passing
- Conform by the merge request performance guides
- Conform by the style guides
Branch has no merge conflicts with
master(if it does - rebase it please)
- Squashed related commits together
What are the relevant issue numbers?
Closes #32995 (closed)