Add new features to generate_workflows.sh

[Copilot]

This PR enhances the generate_workflows.sh script with several new features and improvements to provide better usability and flexibility for workflow generation.

Key Changes

Required Features

• Made -A (account) option required: The script now validates that an HPC account is provided and fails with a clear error message if missing
• Added build_compute.sh support: New -B/--build-compute option allows using build_compute.sh instead of build_all.sh for compute node builds
• Enhanced DATAROOT deletion messaging: Improved error messages when users opt not to delete DATAROOT, providing clear guidance on how to proceed
• Added skip link workflow option: New -L/--skip-link option allows skipping the link_workflow.sh step when it's not needed

Major Enhancement

• Converted getopts to getopt: Full conversion to support long arguments for better user experience

Long Options Added

All options now support descriptive long forms:

• --account (required HPC account)
• --build-compute (use build_compute.sh)
• --skip-link (skip link_workflow.sh)
• --delete (auto-delete directories)
• --gfs, --gefs, --sfs, --gcafs (test type selection)
• --yaml, --yaml-dir (YAML configuration)
• --verbose, --very-verbose, --debug (output control)
• And more...

Usage Examples

Before (still supported):

./generate_workflows.sh -A myaccount -b -D /path/to/runtests

Now also supports:

./generate_workflows.sh --account myaccount --build-compute --skip-link --delete /path/to/runtests

Backward Compatibility

All existing short options continue to work exactly as before. The only breaking change is the requirement for the -A account option, which improves error detection and user experience.

Testing

• All argument parsing tested with both short and long options
• Account requirement validation verified
• Option combinations tested
• Shellcheck passes with no issues
• Backward compatibility maintained

Note: GCAFS support was already implemented in the existing code with the -C/--gcafs option and proper build flags.

Fixes #24.

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