Rework/fixes for zimit-frontend

[benoit74]

• Fix Add query parameter to hide schedule / task secret flags on-demand #1013
• Also hide secret flags on GET /requested-tasks/{id} endpoint (was forgotten previously, probably because it is not used in the UI)
• Add notification property on GET /requested-tasks/{id} endpoint

Remark:

• ?hide_secrets= tested locally, works well, complex to test in automated end-to-end

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.33%. Comparing base (100313b) to head (60cc6cb).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1014      +/-   ##
==========================================
+ Coverage   88.28%   88.33%   +0.05%     
==========================================
  Files          96       96              
  Lines        5360     5385      +25     
==========================================
+ Hits         4732     4757      +25     
  Misses        628      628              

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[benoit74]

Edit: update first message with some details

[benoit74]

Edit: added notification property on requested-tasks endpoint, it is needed / used by zimit-frontend

[rgaudin]

LGTM ; indeed a new use case: authenticated but without secrets.