chore: productQueryPage - refactored without ScaffoldMessenger

[monsieurtanuki]

Impacted file:

• product_query_page.dart: refactored without ScaffoldMessenger, which has no impact on the app but bigger impact on the code format.

What

• Just removed a now useless Widget, which has only an impact on code format.
• The idea was NOT to code relevant changes while changing the format too - easier to review this way

[codecov-commenter]

Codecov Report

Merging #2769 (7a6171e) into develop (2ea0da3) will decrease coverage by 1.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop   #2769      +/-   ##
==========================================
- Coverage     8.86%   7.12%   -1.74%     
==========================================
  Files          161     218      +57     
  Lines         6623   10622    +3999     
==========================================
+ Hits           587     757     +170     
- Misses        6036    9865    +3829     

Impacted Files	Coverage Δ
...kages/smooth_app/lib/widgets/attribute_button.dart	0.00% <0.00%> (-92.00%)	⬇️
...s/smooth_app/lib/data_models/user_preferences.dart	8.73% <0.00%> (-23.57%)	⬇️
packages/smooth_app/lib/themes/smooth_theme.dart	62.26% <0.00%> (-20.72%)	⬇️
...p/lib/generic_lib/dialogs/smooth_alert_dialog.dart	15.11% <0.00%> (-19.10%)	⬇️
...mooth_app/lib/data_models/product_preferences.dart	21.68% <0.00%> (-9.75%)	⬇️
packages/smooth_app/lib/main.dart	14.65% <0.00%> (-3.24%)	⬇️
.../smooth_app/lib/pages/onboarding/welcome_page.dart	0.00% <0.00%> (-3.13%)	⬇️
.../smooth_app/lib/pages/onboarding/scan_example.dart	0.00% <0.00%> (-2.28%)	⬇️
...ackages/smooth_app/lib/pages/scan/scan_header.dart	2.50% <0.00%> (-2.27%)	⬇️
...p/lib/pages/onboarding/consent_analytics_page.dart	0.00% <0.00%> (-1.57%)	⬇️
... and 237 more

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