refactor: Remove user argument from reloading ontology cache

[BalduinLandolt]

Pull Request Checklist

Task Description/Number

Remove unused parameter and obsolete checks. Reloading ontologies in ontology cache does not require a requesting user.

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)
• deprecated: Deprecation warning (ideally referencing a migration guide)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.55%. Comparing base (6ebe8e7) to head (b70f381).
Report is 151 commits behind head on main.

Files with missing lines	Patch %	Lines
...api/slice/admin/api/service/StoreRestService.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3447      +/-   ##
==========================================
- Coverage   83.04%   82.55%   -0.50%     
==========================================
  Files         290      309      +19     
  Lines       23087    22791     -296     
==========================================
- Hits        19172    18814     -358     
- Misses       3915     3977      +62     

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