Add Clabernetes runtime support

[FloSch62]

Summary

• Add the Clabernetes/c9s runtime path for running containerlab topologies through Kubernetes
• Support core runtime operations including deploy, inspect, exec, lifecycle actions, destroy, and events
• Add c9s-compatible Robot coverage for the supported Linux lifecycle flow

[codecov]

Codecov Report

❌ Patch coverage is 51.52530% with 1303 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.09%. Comparing base (601b0a2) to head (21a064c).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
labruntime/clabernetes/files.go	56.88%	170 Missing and 46 partials ⚠️
core/labruntime.go	43.26%	160 Missing and 21 partials ⚠️
labruntime/clabernetes/events.go	20.28%	163 Missing and 2 partials ⚠️
labruntime/clabernetes/lifecycle.go	54.70%	87 Missing and 43 partials ⚠️
labruntime/clabernetes/iface_stats.go	16.00%	121 Missing and 5 partials ⚠️
labruntime/clabernetes/nodes.go	51.47%	81 Missing and 34 partials ⚠️
labruntime/clabernetes/save.go	30.70%	78 Missing and 1 partial ⚠️
labruntime/clabernetes/resources.go	66.15%	49 Missing and 17 partials ⚠️
core/events/stream.go	0.00%	46 Missing ⚠️
labruntime/clabernetes/exec.go	56.86%	29 Missing and 15 partials ⚠️
... and 13 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3217      +/-   ##
==========================================
- Coverage   57.51%   57.09%   -0.43%     
==========================================
  Files         251      266      +15     
  Lines       26677    29488    +2811     
==========================================
+ Hits        15344    16835    +1491     
- Misses       9639    10721    +1082     
- Partials     1694     1932     +238     

Files with missing lines	Coverage Δ
cmd/deploy.go	89.87% <100.00%> (+0.04%)	⬆️
cmd/destroy.go	94.87% <100.00%> (+0.06%)	⬆️
cmd/inspect.go	79.51% <100.00%> (+0.25%)	⬆️
cmd/options.go	90.64% <100.00%> (+2.52%)	⬆️
cmd/restart.go	84.61% <100.00%> (+0.61%)	⬆️
cmd/start.go	84.61% <100.00%> (+0.61%)	⬆️
cmd/stop.go	84.61% <100.00%> (+0.61%)	⬆️
core/deploy.go	58.20% <100.00%> (+0.22%)	⬆️
core/destroy.go	56.84% <100.00%> (+0.29%)	⬆️
core/exec.go	60.71% <100.00%> (+3.02%)	⬆️
... and 27 more

... and 13 files with indirect coverage changes

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