Exclude mock_check_resolver from code coverage

[miparnisari]

Checklist

• I agree to the terms within the OpenFGA Code of Conduct.

Describe the problem you'd like to have solved

https://app.codecov.io/gh/openfga/openfga/blob/main/internal%2Fgraph%2Fmock_check_resolver.go

internal/graph/mock_check_resolver.go has 71.43% coverage.

Describe the ideal solution

Two options:

1. Call Close() on the MockCheckResolver whenever it's used to bring coverage up, or
2. Exclude this file from code coverage.

Or both :)

Alternatives and current workarounds

No response

Additional context

No response

[github-actions]

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