Add Tuya Beok thermostat TGM50-ZB-WPB _TZE284_cvub6xbb variant

[xy8000]

Proposed change

Add _TZE284_cvub6xbb to existing Beok thermostat quirk TGM50-ZB-WPB.
Based on: Add Beok thermostat _TZE204_cvub6xbb #3890
Which is based on: Koenkk/zigbee2mqtt#25771

Additional information

Closes: #4446
I tested some entities on my device. Things I could not test:

• Factory reset (I do not have a test-setup)
• Sensor Mode (I do not have an external sensor)

Other things are working as expected.

Device diagnostics

zha-01JFJTVFRDYDGYNA5K5ZJQ7X0T-_TZE284_cvub6xbb TS0601-7b730f4cc22f3fda7bf480c06a52e757.json

Checklist

• The changes are tested and work correctly
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify that the new code works
• Device diagnostics data has been attached

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.28%. Comparing base (35d1fc1) to head (fe64234).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #4554   +/-   ##
=======================================
  Coverage   92.28%   92.28%           
=======================================
  Files         371      371           
  Lines       12158    12158           
=======================================
  Hits        11220    11220           
  Misses        938      938           

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[TheJulianJES]

Thanks!