Added Clone button to Snippet view

What does this MR do?

The MR integrates the new Clone dropdown button component into snippet_blob_view to support the versioning story of the Snippets.

How to click-test locally?

1. Enable :snippets_vue feature flag locally (in Rails console: Feature.enable(:snippets_vue))
2. Enable :version_snippets flag for your user (in Rails console: Feature.enable(:version_snippets, your_user))
3. Update any existing snippet (just change something and save)
4. The button should be visible now.

Screenshots

Simple viewer	Rich viewer	Rich viewer + expanded clone dropdown

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Closes #204730 (closed)