Initialize controller-runtime logger in operator

[jhrozek]

The controller-runtime logger was never initialized, so it used a no-op logger by default and all operator log output was silently discarded.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 68.53%. Comparing base (c46ae47) to head (e4cdbe6).

Files with missing lines	Patch %	Lines
cmd/thv-operator/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3982      +/-   ##
==========================================
- Coverage   68.56%   68.53%   -0.03%     
==========================================
  Files         437      437              
  Lines       44662    44663       +1     
==========================================
- Hits        30621    30611      -10     
- Misses      11657    11674      +17     
+ Partials     2384     2378       -6     

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