Rename and added a robust error handling functionality to the R/assign_job_queue.R file functions

[Seyi007]

• Implement error handling for mapOption2Process, get_proc_medians, write_proc_medians_table, get_proc_weights, advanced_opts2est_walltime, assign_job_queue, and plot_estimated_walltimes .
• Validate input arguments for each function to ensure they meet expected criteria.
• Use tryCatch blocks to handle errors and warnings gracefully.
• Provide informative error messages and detailed logging where appropriate.
• Ensure functions fail gracefully and provide useful feedback.

Also renamed the functions to the following; assign_job_queue -> assignJobQueue make_opts2procs -> mapOption2Process map_advanced_opts2procs -> mapAdvOption2Process get_proc_medians - calculateProcessRuntime write_proc_medians_table -> writeProcessRuntime2TSV write_proc_medians_yml -> writeProcessRuntime2YML get_proc_weights -> getProcessRuntimeWeights advanced_opts2est_walltime -> calculateEstimatedWallTimeFromOpts plot_estimated_walltimes -> plotEstimatedWallTimes

• [x] Feature (adds or updates new capabilities)
• [ ] Bug fix (fixes an issue).
• [x] Enhancement (adds functionality).
• [ ] Breaking change (these changes would cause existing functionality to not work as expected).

Checklist

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• [x] I have read and followed the CONTRIBUTING.md guidelines.
• [x] I have searched for existing content to ensure this is not a duplicate.
• [x] I have performed a self-review of these additions (including spelling, grammar, and related).
• [x] I have added comments to my code to help provide understanding.
• [ ] I have added a test which covers the code changes found within this PR.
• [ x] I have deleted all non-relevant text in this pull request template.
• [x] Reviewer assignment: @jananiravi @the-mayer