chore: Remove feature flag for secured algolia api key

[brobro10000]

Removing feature flag related to the secured_algolia_api_key which validated if the enterprise customer had the catalogQuerySearchFiltersEnabled enabled. The feature is currently enabled for all customers deprecating the usage of the waffle flag itself.

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)
• Ensure English strings are marked for translation. See documentation for more details.

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.34%. Comparing base (bc0ecec) to head (952e7cf).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1399      +/-   ##
==========================================
- Coverage   90.35%   90.34%   -0.02%     
==========================================
  Files         419      419              
  Lines        9475     9462      -13     
  Branches     2275     2206      -69     
==========================================
- Hits         8561     8548      -13     
  Misses        880      880              
  Partials       34       34              

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