MODEL-1489: Allow marking Label with "is_benchmark_reference" flag

[dubininsergey]

Description

This PR enables marking import labels with "is_benchmark_reference" flag. Such labels will be set as benchmark references if the target project support "benchmark" quality mode.

https://www.loom.com/share/ccca6e59420b4848b5f146c9fdbe9950

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Document change (fix typo or modifying any markdown files, code comments or anything in the examples folder only)

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• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you provided a description?
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New Feature Submissions

• [x] Does your submission pass tests?
• [x] Have you added thorough tests for your new feature?
• [ ] Have you commented your code, particularly in hard-to-understand areas?
• [ ] Have you added a Docstring?

Changes to Core Features

• [x] Have you written new tests for your core changes, as applicable?
• [x] Have you successfully run tests with your changes locally?
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[dubininsergey]

The PR is awaiting for the complementary changes in the BE to be merged/deployed

[review-notebook-app[bot]]

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