Revert "Merge branch 'backend-overhaul' into master"

[ashishkumar468]

This reverts commit 0090f24, reversing
changes made to 9bccbfe.

[tests-checker]

Could you please add tests to make sure this change works as expected?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@cbdfb05). Click here to learn what that means.
The diff coverage is 2.97%.

@@           Coverage Diff            @@
##             master   #3125   +/-   ##
========================================
  Coverage          ?   4.66%           
========================================
  Files             ?     264           
  Lines             ?   12400           
  Branches          ?    1057           
========================================
  Hits              ?     579           
  Misses            ?   11777           
  Partials          ?      44

Impacted Files	Coverage Δ
...e/nrw/commons/di/ContentProviderBuilderModule.java	0% <ø> (ø)
...ain/java/fr/free/nrw/commons/upload/FileUtils.java	21.62% <ø> (ø)
...n/java/fr/free/nrw/commons/CommonsApplication.java	0% <0%> (ø)
...nrw/commons/modifications/ModifierSequenceDao.java	0% <0%> (ø)
...ons/explore/categories/SearchCategoryFragment.java	0% <0%> (ø)
.../java/fr/free/nrw/commons/di/NetworkingModule.java	0% <0%> (ø)
.../fr/free/nrw/commons/widget/PicOfDayAppWidget.java	0% <0%> (ø)
...r/free/nrw/commons/auth/AuthenticatedActivity.java	0% <0%> (ø)
...w/commons/category/CategoryImagesListFragment.java	0% <0%> (ø)
.../free/nrw/commons/category/CategoryImageUtils.java	0% <0%> (ø)
... and 39 more

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