Merge branch 'deprecate-public_endpoint' into 'develop'

Deprecate Uploaders.S3, :public_endpoint

See merge request pleroma/pleroma!3251

diff --cc CHANGELOG.md
Simple merge

diff --cc config/config.exs
Simple merge

diff --cc config/test.exs
Simple merge

diff --cc lib/pleroma/config/deprecation_warnings.ex
Simple merge

diff --cc lib/pleroma/upload.ex
Simple merge

diff --cc test/pleroma/config/deprecation_warnings_test.exs
Simple merge

diff --cc test/pleroma/object_test.exs
Simple merge

diff --cc test/pleroma/scheduled_activity_test.exs
Simple merge

diff --cc test/pleroma/upload_test.exs
Simple merge

diff --cc test/pleroma/uploaders/s3_test.exs
Simple merge

diff --cc test/pleroma/user/backup_test.exs
Simple merge

diff --cc test/support/data_case.ex
Simple merge

diff --cc test/support/helpers.ex
Simple merge