[front] fix date format (timestamp) in horizontal bars widget (#7921)

[CelineSebe]

Proposed changes

• change horizontalBarsChartOptions

Related issues

• [Dashboard] Date displayed as non-human readable format (timestamp) #7921

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.21%. Comparing base (080858e) to head (94e6c02).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8032      +/-   ##
==========================================
+ Coverage   66.14%   66.21%   +0.06%     
==========================================
  Files         597      597              
  Lines       60375    60457      +82     
  Branches     6190     6193       +3     
==========================================
+ Hits        39937    40031      +94     
+ Misses      20438    20426      -12     

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[SarahBocognano]

Tested ✅

[lndrtrbn]

What means this value.length === 15 ?

[CelineSebe]

Timestamp has 15 characters...

[lndrtrbn]

In my opinion the fix should be done in the file calling the function horizontalBarsChartOptions, not in this file. We have the possibility already to pass a function yFormatter to format the value. So use this to transform the timestamp in date string when necessary directly in the widget component when the attribute is a date.

PTO