Upload a package file regression

Summary

Since 14.6 no response when uploading artifact to package registry.

Steps to reproduce

Upload artifact to package registry https://docs.gitlab.com/ee/api/packages/maven.html#upload-a-package-file

curl --request PUT \
     --upload-file path/to/mypkg-1.0-SNAPSHOT.pom \
     --header "Private-Token: <personal_access_token>" \
     "https://gitlab.example.com/api/v4/projects/1/packages/maven/foo/bar/mypkg/1.0-SNAPSHOT/mypkg-1.0-SNAPSHOT.pom"

Before 14.6, response contains json with file_sha1 and updated_at. Now, response is null.

Example Project

What is the current bug behavior?

Regression, response is null.

What is the expected correct behavior?

A json response with file_sha1 and updated_at attributes.

Relevant logs and/or screenshots

Output of checks

Sample of previous response :

{"id":86865,"package_id":8041,"created_at":"2021-03-12T16:29:49.768Z","updated_at":"2021-03-12T16:29:49.768Z","size":200857,"file_store":2,"file_md5":"38f774e5f5d0179922d12b25787bf9ba",
"file_sha1":"b0d09c01f1229c3f390b63335808c13e33eb5b9b","file_name":"commons-io-2.8.jar","file":{"url":"https://krp2pfkistgbluereg.blob....zsTyO1oQAYFAeH9tITKxAM2p2wIVvKE2M9VPw%3D"},
"verification_retry_at":null,"verified_at":null,"verification_failure":null,"verification_retry_count":null,"file_sha256":null,"verification_checksum":null,"verification_state":0,"verification_started_at":null}

Actual response : null

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes