Allow loading device without power data config

[chernyee]

Motivate of the pull request

• To address an existing issue. If so, please provide a link to the issue:
• Breaking new feature. If so, please describe details in the description part.

Describe the technical details

Changes:

1. Allow devices without power_data config in device.xml to be loaded in RPE
2. Do not raise exception if a device has not power_data config.
3. Do not exit backend process when a device has not power_data config
4. Allow RPE to run even there are devices without power_data config.

Which part of the code base require a change

• Frontend:
• Backend: DeviceManager, PowerCfg modules
• Library: <Specify the library name, e.g. npm packages>
• Plug-in: <Specify the plugin name, e.g. Webpack, jtest>
• Documentation
• Regression tests
• Continuous Integration (CI) scripts

[codecov]

Codecov Report

Attention: Patch coverage is 80.39216% with 10 lines in your changes missing coverage. Please review.

Project coverage is 68.36%. Comparing base (b60093c) to head (ce2fc9a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/submodule/rs_device_resources.py	58.33%	5 Missing ⚠️
backend/submodule/rs_power_config.py	81.25%	3 Missing ⚠️
backend/submodule/rs_device.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   68.35%   68.36%           
=======================================
  Files         110      110           
  Lines        8574     8602   +28     
=======================================
+ Hits         5861     5881   +20     
- Misses       2713     2721    +8     

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