Need to convert non-str values to str before applying sanitisation

[tieneupin]

The new logs I added for the 'data_collection' block in 'feedback_callback()' didn't sanitise the dictionary values from the message correctly. They need to be stringified first (as they could be non-str) before sanitisation. This PR should fix that.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 28.78%. Comparing base (8567d8d) to head (2455e65).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #564      +/-   ##
==========================================
- Coverage   28.78%   28.78%   -0.01%     
==========================================
  Files          80       80              
  Lines       10605    10604       -1     
  Branches     1414     1414              
==========================================
- Hits         3053     3052       -1     
  Misses       7450     7450              
  Partials      102      102              

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