[Security Solution] Fix related_integrations Cypress test flake (elas…

…tic#173393)

## Summary

- Replaces the installation of all available prebuilt rule for the rule
that was just created. This stops flake in which a race condition would
case the full Fleet package installation to be installed, and then us
purposely installing **all** rules.

## Flaky test runner

https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/4574

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

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Co-authored-by: Kibana Machine <[email protected]>