Disable Sidekiq arguments logging by default

Conflicts:
	config/initializers/4_sidekiq.rb
Properly fix wiki restore.

ProjectWiki.new() creates a new wiki git repository, so any tries
to bare clone a bundle fail. With this patch we remove the newly
created wiki.git before restoring from the backup bundle.

Conflicts:
	lib/backup/repository.rb
Remove unnecessary backported change

Make the diff with 7.5.1 smaller.
Add wiki restore fix to CHANGELOG
Merge branch 'release/7.5.2' into '7-5-stable'

Fixes for 7.5.2

See merge request !1283
Version 7.5.2