Remove logartifact calls from tutorial and examples

[RomeoV]

Summary

Removes calls to the non-existent logartifact function that was causing UndefVarError. Provides a temporary workaround with clear TODO comments for future implementation.

Changes

• Commented out logartifact(mlf, exprun, plotfilename) calls in both tutorial and examples
• Commented out rm(plotfilename) to preserve plot files since they can't be uploaded
• Added TODO comments with reference to issue Tutorial references missing logartifact function #61
• Added explanatory comments about the temporary workaround

Problem

The tutorial and examples called a non-existent function:

logartifact(mlf, exprun, plotfilename)  # ❌ UndefVarError: logartifact not defined

The logartifact function is not implemented in the current codebase, only listartifacts exists.

Solution

Temporary workaround until artifact upload is implemented:

# TODO: Upload the plot as an artifact when logartifact function is implemented
# See: https://github.com/JuliaAI/MLFlowClient.jl/issues/61
# logartifact(mlf, exprun, plotfilename)

# Keep the plot file since artifact upload is not yet available
# rm(plotfilename)

Benefits

• ✅ Makes the tutorial examples functional (no more UndefVarError)
• ✅ Preserves the intent for future artifact upload implementation
• ✅ Keeps plot files available for manual inspection
• ✅ Clear documentation of what needs to be implemented
• ✅ References the tracking issue for artifact upload feature

Impact

• Tutorial examples now run without errors
• Users can still see generated plots (just not uploaded to MLFlow)
• Clear path forward for implementing artifact upload functionality
• Maintains tutorial completeness while being honest about current limitations

Test plan

• Verified logartifact function does not exist in codebase
• Confirmed plot files are still generated and saved locally
• Added proper TODO comments with issue references
• Both tutorial and example files updated consistently

Fixes #61 (temporary workaround until function is implemented)

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