Tests: fix deprecated TM mape

[Borda]

What does this PR do?

in TM the mean_relative_error was deprecated

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[codecov]

Codecov Report

Merging #8830 (372ca01) into master (3ef8cd6) will decrease coverage by 4%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #8830    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
=======================================
  Files         169     169            
  Lines       14072   14072            
=======================================
- Hits        13044   12466   -578     
- Misses       1028    1606   +578