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Disable method replacement in avatar loading

Stan Hu requested to merge sh-disable-batch-load-replace-methods into master

We've seen a significant performance penalty when using BatchLoader#__replace_with!. This defines methods on the batch loader that proxy to the 'real' object using send. The alternative is method_missing, which is slower. However, we've noticed that method_missing can be faster if:

  1. The objects being loaded have a large interface.
  2. We don't call too many methods on the loaded object.

Avatar uploads meet both criteria above, so let's use the newly-released feature in https://github.com/exAspArk/batch-loader/pull/45.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60903

Edited by Stan Hu

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