bugfix: Process nodes in generators CTL when no variables are passed in

[FragmentedPacket]

Add processing of nodes when no variables are passed into CLI so the nodes get added into the store.

This added generator.process_nodes call that the generator.collect_data method typically handles, but since we're collecting data outside, .process_nodes was never called within infrahubctl.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
infrahub_sdk/generator.py	0.00%	2 Missing ⚠️

@@             Coverage Diff             @@
##           develop     #176      +/-   ##
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+ Coverage    66.22%   66.56%   +0.33%     
===========================================
  Files           76       81       +5     
  Lines         7031     7231     +200     
  Branches      1388     1410      +22     
===========================================
+ Hits          4656     4813     +157     
- Misses        1989     2035      +46     
+ Partials       386      383       -3     

Flag	Coverage Δ
integration-tests	7.17% <0.00%> (?)
python-3.10	43.88% <0.00%> (-1.20%)	⬇️
python-3.11	43.88% <0.00%> (-1.20%)	⬇️
python-3.12	43.88% <0.00%> (-1.20%)	⬇️
python-3.13	43.88% <0.00%> (-1.20%)	⬇️
python-3.9	42.28% <0.00%> (-1.88%)	⬇️
python-filler-3.12	24.50% <0.00%> (+0.55%)	⬆️

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Files with missing lines	Coverage Δ
infrahub_sdk/ctl/generator.py	23.63% <ø> (+0.42%)	⬆️
infrahub_sdk/generator.py	35.52% <0.00%> (+0.46%)	⬆️

... and 42 files with indirect coverage changes