Modernize fan control scripts to use shared utilities

[coelacant1]

Description

The fan control scripts have not been updated to use the current shared utility framework:

• Host/FanControl/DellIPMIFanControl.sh - Dell IPMI fan control, hardware dependent
• Host/FanControl/EnablePWMFanControl.sh - PWM fan control, hardware dependent

These scripts need to be modernized to use ArgumentParser.sh for argument handling and follow current script conventions established by recently updated scripts. Being hardware-dependent, they need careful testing considerations noted in the scripts.

Acceptance Criteria

• DellIPMIFanControl.sh uses ArgumentParser.sh for argument handling
• EnablePWMFanControl.sh uses ArgumentParser.sh for argument handling
• Both scripts source shared utilities consistently
• Hardware dependency requirements are documented in script headers
• Existing functionality preserved