Fix case sensitive array query parameters

[jascks]

Description:
My first attempt (#8852) at fixing this issue did not accommodate the scenario where a query parameter is provided more than once. When that happens, the Express query parser aggregates the values for the key into an array. Thus, when the order=ASC parameter is specified a single time, the value is simply a string. However order=ASC&order=ASC results in the single order key, but this time with a value of [ ASC, ASC].

The solution is to accommodate the possibility of the array, and in that case to canonicalize each element individually.

Related issue(s):

Fixes #8790

Notes for reviewer:
Beyond the fact this scenario was not tested for previously, my assumption was that the process of merging multiple values within requestQueryParser() was handling this possibility. And, it was in the sense that the original code could handle whether the request parameter was a single value or an array, and that it was also merging to support case-insensitive keys.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.34%. Comparing base (96acb4c) to head (85162c3).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8988      +/-   ##
============================================
- Coverage     92.34%   92.34%   -0.01%     
  Complexity     7515     7515              
============================================
  Files           909      909              
  Lines         30233    30237       +4     
  Branches       3698     3699       +1     
============================================
+ Hits          27920    27921       +1     
- Misses         1491     1494       +3     
  Partials        822      822              

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[xin-hedera]

LGTM