Fix pre-commit isort failure on tests/plugins/*.py

[arnaudgelas]

What does this PR do?

Relates to #4805

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[ydcjeff]

Is this all changes applied by isort in tests/plugins/* ?

[arnaudgelas]

@ydcjeff yes

[arnaudgelas]

Please first merge #5421

[Borda]

@arnaudgelas it seems you introduced a cumulative change from other PR, mind keep the change only to files mentioned in the PR, so here it is tests/plugins/*.py

[codecov]

Codecov Report

Merging #5422 (4b6d196) into release/1.2-dev (e806bb7) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release/1.2-dev   #5422   +/-   ##
===============================================
  Coverage               93%     93%           
===============================================
  Files                  152     152           
  Lines                10732   10732           
===============================================
  Hits                  9944    9944           
  Misses                 788     788