fix: do not call read auth model on batchcheck and write

[ewanharris]

Description

Removes the read auth model call in BatchCheck/Write and replaces it with checking and returning an invalid model id error and then returning an invalid auth error if one arises.

References

Part of openfga/sdk-generator#314

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 22.49%. Comparing base (d27ef8f) to head (e9b3d66).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   22.51%   22.49%   -0.03%     
==========================================
  Files          94       94              
  Lines        9758     9750       -8     
==========================================
- Hits         2197     2193       -4     
+ Misses       7308     7306       -2     
+ Partials      253      251       -2     

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[rhamzeh]

2790f77 (#78)
can be removed