Remove defaulting of translation_key

[TheJulianJES]

Part 2 of changes related to: zigpy/zigpy#1488

Proposed change

translation_key no longer defaults to attribute_name or command_name.
There's more information in the linked zigpy PR below on why this should be the case.

Additional information

Somewhat requires this zigpy PR to ensure translation_key or device_class is provided for a proper name:

• Require fallback_name and add translation_key validation zigpy#1488

Requires for tests to pass:

• Add translation_key and fallback_name to tests #252

I wanted to keep these changes separate from #252, as the changes are only semi-related.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.31%. Comparing base (c6c1888) to head (b41f15c).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #251      +/-   ##
==========================================
+ Coverage   96.27%   96.31%   +0.04%     
==========================================
  Files          61       61              
  Lines        9367     9363       -4     
==========================================
  Hits         9018     9018              
+ Misses        349      345       -4     

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[puddly]

Will this require any changes in quirks, to manually add the defaults?

[TheJulianJES]

Somewhat. When zigpy is bumped in the quirks repo, quirks missing translation_key will fail to validate.
At the moment, the zha-quirks version used for ZHA doesn't contain any quirks v2 entities.
The next version of zha-quirks will contain quirks v2 entities, but in the quirks repo, a translation_key and fallback_name is already present for all of those. (only some tests were missing it: zigpy/zha-device-handlers#3449)

So, only custom quirks would need changes. But they'll throw a validation error with the next zigpy version if they're missing fallback_name or translation_key.