Upload: Make metrics tests compatible with jest@26

[gu-stav]

What does it do?

#13721 introduced a test which is dependent on jest@v28. We had to downgrade jest in #13861 to v26, because it created too many problems.

This PR aims to make test compatible with jest@v26.

[codecov]

Codecov Report

Merging #13862 (d886f50) into features/ML-folder (9b32167) will decrease coverage by 7.02%.
The diff coverage is 76.27%.

@@                  Coverage Diff                   @@
##           features/ML-folder   #13862      +/-   ##
======================================================
- Coverage               55.22%   48.19%   -7.03%     
======================================================
  Files                    1223      245     -978     
  Lines                   31101     9088   -22013     
  Branches                 5689     2005    -3684     
======================================================
- Hits                    17174     4380   -12794     
+ Misses                  12134     3883    -8251     
+ Partials                 1793      825     -968     

Flag	Coverage Δ
front	?
unit	48.19% <76.27%> (-0.28%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tent-type-builder/server/services/content-types.js	27.18% <ø> (ø)
...erver/services/schema-builder/component-builder.js	14.03% <0.00%> (ø)
...er/services/schema-builder/content-type-builder.js	8.73% <ø> (ø)
...pe-builder/server/services/schema-builder/index.js	10.14% <0.00%> (ø)
packages/core/database/lib/migrations/index.js	30.00% <0.00%> (ø)
packages/core/strapi/lib/services/metrics/index.js	61.53% <0.00%> (-2.47%)	⬇️
packages/core/upload/server/middlewares/upload.js	66.66% <ø> (ø)
packages/core/admin/server/controllers/admin.js	34.93% <12.50%> (-2.40%)	⬇️
...b/sanitize/visitors/remove-restricted-relations.js	62.16% <85.71%> (+53.07%)	⬆️
...ges/core/admin/utils/get-custom-app-config-file.js	100.00% <100.00%> (ø)
... and 1030 more

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