Remove PermanentOwnable and ProxyBeacon as they have been deprecated due to OpenZeppelin upgrade. Adjust tests accordingly.

[joYyHack]

• Since this PR suggests a bug fix, the tests have been added and the coverage is 100%.
• Since this PR introduces a new feature, the update has been discussed in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

---

Remove PermanentOwnable and ProxyBeacon as they have been deprecated due to OpenZeppelin upgrade. Adjust tests accordingly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.94%. Comparing base (2a16029) to head (a9879cb).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- Coverage   99.94%   99.94%   -0.01%     
==========================================
  Files          57       54       -3     
  Lines        3404     3383      -21     
  Branches      459      455       -4     
==========================================
- Hits         3402     3381      -21     
  Misses          2        2              

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[Arvolear]

LGTM!