Eliminate unnecessary URL options from the command line.

[BenGalewsky]

This pull request removes the --url option from various CLI commands and updates the documentation accordingly. The changes ensure that the client now relies solely on the --backend option to determine the ServiceX server.

The --url option was never used. It's easy enough to just add a new entry to .servicex and this option was cluttering up the code

Key changes include:

Documentation Updates:

• docs/command_line.rst: Removed the -u/--url option from the list of common command line arguments and updated the description to reflect that only the --backend option is required.

Code Changes:

• servicex/app/cli_options.py: Removed the url_cli_option definition.
• servicex/app/codegen.py: Removed the url parameter from the flush and list commands and their respective ServiceXClient instantiations. [1] [2]
• servicex/app/datasets.py: Removed the url parameter from the list, get, and delete commands and their respective ServiceXClient instantiations. [1] [2] [3] [4] [5]
• servicex/app/transforms.py: Removed the url parameter from the list, files, download, and logs commands and their respective ServiceXClient instantiations. [1] [2] [3] [4] [5] [6] [7] [8] [9]

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 88.05%. Comparing base (2e2af1b) to head (142cc50).

Files with missing lines	Patch %	Lines
servicex/app/transforms.py	20.00%	4 Missing ⚠️
servicex/app/datasets.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #530      +/-   ##
==========================================
- Coverage   88.05%   88.05%   -0.01%     
==========================================
  Files          26       26              
  Lines        1658     1657       -1     
==========================================
- Hits         1460     1459       -1     
  Misses        198      198              

Flag	Coverage Δ
unittests	88.05% <41.66%> (-0.01%)	⬇️

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[kyungeonchoi]

Thanks for the very nice summary of the PR! At some point we might want to delete URL option from ServiceXClient itself.