Improve the error message when using InstanceId.load with a tuple of wrong length

[MortGron]

Description

Curren error message talks about missing external ID key

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• Changelog updated in CHANGELOG.md.
• Version bumped. If triggering a new release is desired, bump the version number in _version.py and pyproject.toml per semantic versioning.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.65%. Comparing base (a9d591a) to head (74dc4b0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2179   +/-   ##
=======================================
  Coverage   90.65%   90.65%           
=======================================
  Files         159      159           
  Lines       24135    24138    +3     
=======================================
+ Hits        21880    21883    +3     
  Misses       2255     2255           

Files with missing lines	Coverage Δ
cognite/client/_version.py	100.00% <100.00%> (ø)
cognite/client/utils/_identifier.py	88.65% <100.00%> (+0.40%)	⬆️

... and 2 files with indirect coverage changes

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