Always raise MyBMWAuthError during login

[rikroe]

Proposed change

Always raise MyBMWAuthError when a HTTP error occurs during authentication.

This should solve retry loops due to quota issues like here and trigger the HA reauthentication flow (stopping retries).

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #BMW Connected Drive - no longer possible to login in after update to HAss 2024.8.2 home-assistant/core#124464
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ef3db68) to head (51b0641).
Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #650   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           17        17           
  Lines         1428      1418   -10     
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- Hits          1428      1418   -10     

Flag	Coverage Δ
3.10	100.00% <100.00%> (ø)
3.11	100.00% <100.00%> (ø)
3.12	100.00% <100.00%> (ø)
3.8	100.00% <100.00%> (ø)
3.9	100.00% <100.00%> (ø)

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