Harden JSONP callback filter (Skosmos 3)

[osma]

Reasons for creating this PR

Same as PR #1553, but for Skosmos 3. See that PR for rationale and details.

Link to relevant issue(s), if any

• follow-up fix for Add support for PHP 8.1 #1385

Description of the changes in this PR

• switch the input filter used for JSONP callback method names to FILTER_SANITIZE_FULL_SPECIAL_CHARS

Known problems or uncertainties in this PR

n/a

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[sonarcloud]

SonarCloud Quality Gate failed.   

34 Bugs
2 Vulnerabilities
25 Security Hotspots
401 Code Smells

No Coverage information
0.6% Duplication

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b4e41b4) 70.51% compared to head (66913be) 70.51%.

Files	Patch %	Lines
src/controller/RestController.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             skosmos-3    #1554   +/-   ##
============================================
  Coverage        70.51%   70.51%           
  Complexity        1643     1643           
============================================
  Files               32       32           
  Lines             4314     4314           
============================================
  Hits              3042     3042           
  Misses            1272     1272           

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