Ayush Chauhan

[mesheryctl] model export - add unit/integration test coverage

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### Current Behavior No unit/integration tests for `meshery model export` subcommand. ### Desired Behavior Write Unit and Integration Tests for the `meshery model export` subcommand. Sub-issue for #14042. ### Implementation...

[mesheryctl] model export - add tests

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**Notes for Reviewers** - This PR fixes #15104 **[Signed commits](https://github.com/meshery/meshery/blob/master/CONTRIBUTING.md#signing-off-on-commits-developer-certificate-of-origin)** - [x] Yes, I signed my commits.