drop deprecated fbeta metrics

[Borda]

What does this PR do?

these metrics were moved and changed cases

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[pep8speaks]

Hello @Borda! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-01-02 00:49:26 UTC

[codecov]

Codecov Report

Merging #5322 (badc955) into release/1.2-dev (fb90eec) will decrease coverage by 0%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           release/1.2-dev   #5322   +/-   ##
===============================================
- Coverage               93%     93%   -0%     
===============================================
  Files                  146     146           
  Lines                10202   10199    -3     
===============================================
- Hits                  9477    9474    -3     
  Misses                 725     725