Add missing jobs for initiatives rake tasks

[moustachu]

This will scheduled daily these 3 rake tasks :

• decidim_initiatives:check_validating
• decidim_initiatives:check_published
• decidim_initiatives:notify_progress

see : https://github.com/decidim/decidim/tree/release/0.27-stable/decidim-initiatives#rake-tasks

+ 2 stowaway :

• add (again) .DS_Store files to .gitignore
• fix a missing space with erblint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6c7442a) 89.34% compared to head (5a73662) 89.34%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #474   +/-   ##
========================================
  Coverage    89.34%   89.34%           
========================================
  Files           65       65           
  Lines         1595     1595           
========================================
  Hits          1425     1425           
  Misses         170      170           

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[Quentinchampenois]

We shouldn't invoke a system command but Objects directly, it allows to implement tests on the job

[Quentinchampenois]

Prefer to call directly objects as the rake task rather than invoking a system command

[moustachu]

I see the point but in that case these tasks already have tests
https://github.com/decidim/decidim/tree/release/0.27-stable/decidim-initiatives/spec/lib/tasks

Besides we might want to call directly these tasks instead of copy the code in them in case this code changes in the future release