Ignore xsi attrs when fail on unknown attributes is enabled

[tefra]

📒 Description

xsi:attributes should be ignored when we enable the parser config option fail_on_unknown_attributes

Resolves #845

🔗 What I've Done

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💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (31f672a) 99.89% compared to head (625a650) 99.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #846   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files         104      104           
  Lines        9282     9284    +2     
  Branches     2076     2076           
=======================================
+ Hits         9272     9274    +2     
  Misses          3        3           
  Partials        7        7           

Files Changed	Coverage Δ
xsdata/formats/dataclass/parsers/nodes/element.py	99.04% <100.00%> (+<0.01%)	⬆️

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