Add suppress-summary flag to model test command

[Siddhant-K-code]

Description

This pull request adds a new flag, suppress-summary, to the test command. When this flag is set to true, the plain text summary output will be suppressed. This provides more flexibility for users who prefer not to see the summary output.

How to test

go run main.go model test --tests /workspace/openfga-cli/example/model.fga.yaml --verbose --suppress-summary

References

fixes #385

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

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[Siddhant-K-code]

@evansims, any plans to introduce this feature to --verbose command?