Separate function for parsing charging_end_time

[rikroe]

Proposed change

This fixes edge cases of being unable to parse the fuelIndicator for chargingEndTime.
In some cases, when the timestamp was not able to be parsed correctly, UnboundLocalError could be raised.

Now, parsing is done in a separate function that is returned early if timestamp parsing fails.

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:
• This PR is related to issue: BMW Connected Drive: 'end_time' referenced before assignment home-assistant/core#61567

Checklist

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

[codecov-commenter]

Codecov Report

Merging #384 (3ad4632) into master (6f15910) will increase coverage by 0.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
+ Coverage   96.61%   96.95%   +0.34%     
==========================================
  Files           8        8              
  Lines         916      921       +5     
==========================================
+ Hits          885      893       +8     
+ Misses         31       28       -3     

Flag	Coverage Δ
3.10.x	96.85% <100.00%> (+0.34%)	⬆️
3.6	96.94% <100.00%> (+0.34%)	⬆️
3.7	96.83% <100.00%> (+0.34%)	⬆️
3.8	96.84% <100.00%> (+0.34%)	⬆️
3.9	96.84% <100.00%> (+0.34%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
bimmer_connected/vehicle_status.py	99.02% <100.00%> (+1.00%)	⬆️

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[github-actions]

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