spike: investigate issues with AB tests

Last release CI started failing because of timeout in the AB tests.
We coudn't find immediate issues, as the timeout was happening not consistently.
A temporary solution was to disable the test to continue with the release.

We should investigate the issue, and fix the test.
Current state:
- missing validation of data, it will just report failed or not during AB conversion
- missing caching of the bundles, building application took around 25-30 minutes

### Acceptance criteria
- [ ] Proposal of solution is documented.
- [ ] Tasks breakdown is documented.