Step 3: Version Control for Snippets: Implement access rights checking for git requests (personal snippet)

Important: All the new functionality must be implemented behind the feature flag :version_snippets. Besides, it has to be scoped for projects. Therefore, instead of checking if the feature flag is enabled or not (Feature.enabled?(:version_snippets)), we will check if the feature flag is enabled for specific projects (Feature.enabled?(:version_snippets, project)). This way, for testing purposes, we can enable the feature flag on the project gitlab-org/gitlab for example, instead of enabling it globally.

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Follow-up issue of #39514 (closed), which dealt with project snippet.

This issue is about implementing the necessary access rights to access the personal snippet repository.

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