Updates Slack bot msg

[fe51]

Small PR in order to improve slack alert bot message :

• Redirect to the platform
• add the link to the img to download
• updates alternative messages

Also, as long as it is not gonna be deployed immediately, we could wait to have url redirecting specifically to an alert and add it here -> hence, issue as draft !

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.92%. Comparing base (af8d048) to head (b8fff9d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #547   +/-   ##
=======================================
  Coverage   87.92%   87.92%           
=======================================
  Files          50       50           
  Lines        1962     1962           
=======================================
  Hits         1725     1725           
  Misses        237      237           

Flag	Coverage Δ
backend	87.94% <ø> (ø)
client	87.50% <ø> (ø)

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