[6.16.z] removing repository entity from bookmarks tests

[Satellite-QE]

Cherrypick of PR: #16300

Problem Statement

I shouldn't have included it within #14542 as it requires additional setup (custom product), also the test path is to a degree similar to the product entity that is covered

Solution

Related Issues

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/ui/test_bookmarks.py -k test_positive_create_bookmark_public[Host]

[Satellite-QE]

PRT Result

Build Number: 8584
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/ui/test_bookmarks.py -k test_positive_create_bookmark_public[Host] --external-logging
Test Result : ========== 1 failed, 34 deselected, 43 warnings in 659.39s (0:10:59) ===========