Add tasks completion

[renatho]

trafficstars

Part of https://github.com/Automattic/sensei/issues/5633 Based on https://github.com/Automattic/sensei/pull/5902

Changes proposed in this Pull Request

Testing instructions

New/Updated Hooks

Deprecated Code

Screenshot / Video

[codecov[bot]]

Codecov Report

Merging #5933 (6b86c2a) into feature/new-onboarding-experience (87b934c) will increase coverage by 0.02%. The diff coverage is 65.38%.

@@                           Coverage Diff                           @@
##             feature/new-onboarding-experience    #5933      +/-   ##
=======================================================================
+ Coverage                                44.03%   44.06%   +0.02%     
- Complexity                                9192     9194       +2     
=======================================================================
  Files                                      445      446       +1     
  Lines                                    32719    32771      +52     
  Branches                                   253      259       +6     
=======================================================================
+ Hits                                     14407    14439      +32     
- Misses                                   18126    18142      +16     
- Partials                                   186      190       +4     

Impacted Files	Coverage Δ
includes/admin/class-sensei-home.php	0.00% <0.00%> (ø)
includes/class-sensei-data-cleaner.php	89.53% <ø> (ø)
assets/home/tasks-section/index.js	76.31% <72.72%> (-23.69%)	:arrow_down:
assets/home/grid.js	50.00% <100.00%> (ø)
assets/home/tasks-section/ready.js	100.00% <100.00%> (ø)

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